Pteraspis hi-res stock photography and images

Pteraspis is an extinct genus of jawless ocean fish that lived in the Devonian period. Stock Photo

RFDX5EF4–Pteraspis is an extinct genus of jawless ocean fish that lived in the Devonian period.

Palaeozoology - Devonian period - Ostracoderms (primitive fishes) - Pteraspis - Art work by Steve Roberts Stock Photo

RMF02F44–Palaeozoology - Devonian period - Ostracoderms (primitive fishes) - Pteraspis - Art work by Steve Roberts

RMDHCK55–Pteraspis rostrata1

RFH2R4GD–Devonian Pteraspis Fish

Pteraspis is an extinct genus of jawless fish that lived in the Devonian Period. Stock Photo

RFDERXG6–Pteraspis is an extinct genus of jawless fish that lived in the Devonian Period.

RFGW49YH–Pteraspis Fish on White

RFDX5EM0–Pteraspis is an extinct genus of jawless ocean fish that lived in the Devonian period.

Devonian Pteraspis Fish Group Stock Photo

RFH2R7RP–Devonian Pteraspis Fish Group

RFHP11HJ–Pteraspis

Prehistoric marine life. Ostracoderms ('shell-skinned') were the armored jawless fishes such as pteraspis. Stock Photo

RMG156T2–Prehistoric marine life. Ostracoderms ('shell-skinned') were the armored jawless fishes such as pteraspis.

Old Nineteenth century illustration. 1 Pteraspis truncatus. 2 Pteraspis banksii. 3 Ganoid scales. Old 19th century engraved illustration from El Mundo Ilustrado 1879 Stock Photo

RM2EA6CJK–Old Nineteenth century illustration. 1 Pteraspis truncatus. 2 Pteraspis banksii. 3 Ganoid scales. Old 19th century engraved illustration from El Mundo Ilustrado 1879

Pteraspis was a primitive jawless fish that lived in the oceans of the Devonian Period. Stock Photo

RF2NR01EX–Pteraspis was a primitive jawless fish that lived in the oceans of the Devonian Period.

Systematic division of fossil and recent Agnatha Stock Photo

RMEX6NBX–Systematic division of fossil and recent Agnatha

Pteraspis was a carnivorous marine fish that was heavily armored and lived during the Devonian Period. Stock Photo

RF2A5MY21–Pteraspis was a carnivorous marine fish that was heavily armored and lived during the Devonian Period.

Extinct jawless, lobe-finned and armour-plated fish species: Pteraspis, Glyptolaemus, head of Coccosteus, Cephalaspis, Osteolepis, Holoptychius and Pterichthys. Fishes of the old Red Sandstone period. Print after an illustration by Joseph Smit from Henry Neville Hutchinsons Creatures of Other Days, Popular Studies in Palaeontology, Chapman and Hall, London, 1896. Stock Photo

RM2BT58NM–Extinct jawless, lobe-finned and armour-plated fish species: Pteraspis, Glyptolaemus, head of Coccosteus, Cephalaspis, Osteolepis, Holoptychius and Pterichthys. Fishes of the old Red Sandstone period. Print after an illustration by Joseph Smit from Henry Neville Hutchinsons Creatures of Other Days, Popular Studies in Palaeontology, Chapman and Hall, London, 1896.

RM2A5NJD2–Extinct jawless, lobe-finned and armour-plated fish species: Pteraspis, Glyptolaemus, head of Coccosteus, Cephalaspis, Osteolepis, Holoptychius and Pterichthys. Fishes of the old Red Sandstone period. Print after an illustration by Joseph Smit from Henry Neville Hutchinson’s Creatures of Other Days, Popular Studies in Palaeontology, Chapman and Hall, London, 1896.

RMJG6DGR–Pteraspis rostrata

RFR5P0G7–Devonian Pteraspis Fish

RFR5P0G6–Devonian Pteraspis Fish Group

RFR5RJ72–Pteraspis Fish on White

The first fish, Devonian period, Pteraspis miller, vintage engraved illustration. Earth before man – 1886. Stock Vector

RFEW45YE–The first fish, Devonian period, Pteraspis miller, vintage engraved illustration. Earth before man – 1886.

RMDHCK54–Pteraspis rostrata

RF2PYA6B8–Pteraspis was a primitive jawless fish that lived in the oceans of the Devonian Period.

The Victoria history of the county of Cornwall . and prove, as already mentioned,that the Cornish species is correctly described under the name ofP. cornubica. It seems to be the largest species of the genus hithertodiscovered It may be added that in Western Europe Pteraspis is characteristiconly of the Lower Devonian or Lower Old Red Sandstone, not descendingbelow the base of this formation, where it is preceded by [forms with] asimple shield, Cyathaspis. In Galicia, however, typical species occur instrata which are claimed to be of Downtonian or even Ludlow age. Fragmentary remains probably Stock Photo

RM2AX6PBB–The Victoria history of the county of Cornwall . and prove, as already mentioned,that the Cornish species is correctly described under the name ofP. cornubica. It seems to be the largest species of the genus hithertodiscovered It may be added that in Western Europe Pteraspis is characteristiconly of the Lower Devonian or Lower Old Red Sandstone, not descendingbelow the base of this formation, where it is preceded by [forms with] asimple shield, Cyathaspis. In Galicia, however, typical species occur instrata which are claimed to be of Downtonian or even Ludlow age. Fragmentary remains probably

Ostracaderms, (Jawless Fish) from West of England, Early Devonian. Artist: Unknown. Stock Photo

RMMPR7BN–Ostracaderms, (Jawless Fish) from West of England, Early Devonian. Artist: Unknown.

Archive image from page 51 of Devonian fishes of Iowa (1908). Devonian fishes of Iowa . devonianfishesof00east Year: 1908 58 IOWA GEOLOGICAL SURVEY and somewhat later rocks in Lanarkshire. There is, indeed, no doubt that the granular armour was the 'fashionable' fish- skeleton of Upper Silurian time. It soon became usual, however, for the skin-tubercles to fuse together into groups, and in the earliest Devonian faunas the most common Ostracoderms are those like Cepkalaspis and Pteraspis. The first of these (shown in Fig. 4) is especially in- structive as showing how the tubercles became plate Stock Photo

RMW1C37D–Archive image from page 51 of Devonian fishes of Iowa (1908). Devonian fishes of Iowa . devonianfishesof00east Year: 1908 58 IOWA GEOLOGICAL SURVEY and somewhat later rocks in Lanarkshire. There is, indeed, no doubt that the granular armour was the 'fashionable' fish- skeleton of Upper Silurian time. It soon became usual, however, for the skin-tubercles to fuse together into groups, and in the earliest Devonian faunas the most common Ostracoderms are those like Cepkalaspis and Pteraspis. The first of these (shown in Fig. 4) is especially in- structive as showing how the tubercles became plate

. Early Devonian fishes from Utah : Heteroostraci . Fig. 75. Protaspis dorfi; crushed dorsal shield, PF 868 (X 1). essentials with that of P. cf. bucheri, described on page 322. A new restoration of P. (P.) dorfi, based on PF 868, is given in figure 76. The pattern of the dorsal sensory canals agrees with that of Pteraspis. Protaspis (Protaspis) cf. bucheri (Bryant) A dorsal shield (figs. 77, 78), little crushed, and complete except postero-medially, is doubtfully referred to this species. It was col- lected by a student in Utah State Agricultural College from Water Stock Photo

RMMAAWGH–. Early Devonian fishes from Utah : Heteroostraci . Fig. 75. Protaspis dorfi; crushed dorsal shield, PF 868 (X 1). essentials with that of P. cf. bucheri, described on page 322. A new restoration of P. (P.) dorfi, based on PF 868, is given in figure 76. The pattern of the dorsal sensory canals agrees with that of Pteraspis. Protaspis (Protaspis) cf. bucheri (Bryant) A dorsal shield (figs. 77, 78), little crushed, and complete except postero-medially, is doubtfully referred to this species. It was col- lected by a student in Utah State Agricultural College from Water

Prehistoric marine life. Ostracoderms ('shell-skinned') were the armored jawless fishes such as pteraspis. The Placoderms (plate-skinned), climatius and hemicyclaspis were among the first armored jawed fish. Stock Photo

RMG156T1–Prehistoric marine life. Ostracoderms ('shell-skinned') were the armored jawless fishes such as pteraspis. The Placoderms (plate-skinned), climatius and hemicyclaspis were among the first armored jawed fish.

RF2A5MY23–Pteraspis was a carnivorous marine fish that was heavily armored and lived during the Devonian Period.

Infographic of the first fish species appeared on Earth. [QuarkXPress (.qxp); 6259x4015]. Stock Photo

RM2NEBHRA–Infographic of the first fish species appeared on Earth. [QuarkXPress (.qxp); 6259x4015].

RFRC3DEH–Pteraspis Fish Side Profile - Pteraspis was a primitive jawless fish that lived in the oceans of the Devonian Period.

RMJG6DGT–Pteraspis rostrata1

Devonian Animals - A collection of various aquatic animals that lived during the Devonian Period of Earth's history. Stock Photo

RFHNBT44–Devonian Animals - A collection of various aquatic animals that lived during the Devonian Period of Earth's history.

The first fish, Devonian period, Pteraspis rostratus, vintage engraved illustration. Earth before man – 1886. Stock Vector

RFEW45YH–The first fish, Devonian period, Pteraspis rostratus, vintage engraved illustration. Earth before man – 1886.

. Devonian fishes of Iowa. Fishes, Fossil; Paleontology; Paleontology. 58 IOWA GEOLOGICAL SURVEY and somewhat later rocks in Lanarkshire. There is, indeed, no doubt that the granular armour was the "fashionable" fish- skeleton of Upper Silurian time. It soon became usual, however, for the skin-tubercles to fuse together into groups, and in the earliest Devonian faunas the most common Ostracoderms are those like Cepkalaspis and Pteraspis. The first of these (shown in Fig. 4) is especially in- structive as showing how the tubercles became plates, and how the shape of these plates depen Stock Photo

RMPF9KEK–. Devonian fishes of Iowa. Fishes, Fossil; Paleontology; Paleontology. 58 IOWA GEOLOGICAL SURVEY and somewhat later rocks in Lanarkshire. There is, indeed, no doubt that the granular armour was the "fashionable" fish- skeleton of Upper Silurian time. It soon became usual, however, for the skin-tubercles to fuse together into groups, and in the earliest Devonian faunas the most common Ostracoderms are those like Cepkalaspis and Pteraspis. The first of these (shown in Fig. 4) is especially in- structive as showing how the tubercles became plates, and how the shape of these plates depen

The Quarterly journal of the Geological Society of London . think, best be interpreted byreference to the smaller and more perfect one. But with this helpthey enable us to observe some characters not plainly visible on No. 1.Pig. 1 shows three uiidulating lines of imprints, neither parallel * Quart. Journ. Greol. Soc. vol. xii. p. 100. t A fine slab of markings, probably due to Cephalaspjs, exists, or did exist afew years back, in the great Jerrayn Street Collection. It is from the Cornstonebeds of the OJd Red. A still finer one is in the Worcester Museum, 1867.] SALTER—TRACKS OF PTERASPIS. 33 Stock Photo

RM2AN34XA–The Quarterly journal of the Geological Society of London . think, best be interpreted byreference to the smaller and more perfect one. But with this helpthey enable us to observe some characters not plainly visible on No. 1.Pig. 1 shows three uiidulating lines of imprints, neither parallel * Quart. Journ. Greol. Soc. vol. xii. p. 100. t A fine slab of markings, probably due to Cephalaspjs, exists, or did exist afew years back, in the great Jerrayn Street Collection. It is from the Cornstonebeds of the OJd Red. A still finer one is in the Worcester Museum, 1867.] SALTER—TRACKS OF PTERASPIS. 33

Early Devonian fishes from Utah : Heteroostraci earlydevonianfis117deni Year: 1953 338 FIELDIANA: GEOLOGY, VOLUME 11 Fig. 75. Protaspis dorfi; crushed dorsal shield, PF 868 (X 1). essentials with that of P. cf. bucheri, described on page 322. A new restoration of P. (P.) dorfi, based on PF 868, is given in figure 76. The pattern of the dorsal sensory canals agrees with that of Pteraspis. Protaspis (Protaspis) cf. bucheri (Bryant) A dorsal shield (figs. 77, 78), little crushed, and complete except postero-medially, is doubtfully referred to this species. It was col- lected by a student in Stock Photo

RMRYGA2F–Early Devonian fishes from Utah : Heteroostraci earlydevonianfis117deni Year: 1953 338 FIELDIANA: GEOLOGY, VOLUME 11 Fig. 75. Protaspis dorfi; crushed dorsal shield, PF 868 (X 1). essentials with that of P. cf. bucheri, described on page 322. A new restoration of P. (P.) dorfi, based on PF 868, is given in figure 76. The pattern of the dorsal sensory canals agrees with that of Pteraspis. Protaspis (Protaspis) cf. bucheri (Bryant) A dorsal shield (figs. 77, 78), little crushed, and complete except postero-medially, is doubtfully referred to this species. It was col- lected by a student in

. Fig. 46. Fig. 45. Fig. 47. Fig. 45. Rekonstruktion von Pteraspis Crouchi, Lank., aus dem Unter- devon Nordfrankreichs und Englands, von oben gesehen. Fig. 46. Rekonstruktion von Pteraspis Gosseleti, Leriche, aus dem Ober- silur Nordfrankreichs, von oben gesehen. Fig. 47. Rekonstruktion von Pteraspis rostrata, Ag., aus dem Unter- devon Belgiens, Englands und Nordfrankreichs, von oben gesehen. (Alle 3 Figuren sind Orig.-Rekonstr. in 7/9 nat. Gr.) A. - Auge. Rs. = Rostrum. Sk. = Schleimkanäle. Ds. = Dorsalstachel. Sp. = Schlitz in der Cornutalplatte. Stock Photo

RMMCNPP6–. Fig. 46. Fig. 45. Fig. 47. Fig. 45. Rekonstruktion von Pteraspis Crouchi, Lank., aus dem Unter- devon Nordfrankreichs und Englands, von oben gesehen. Fig. 46. Rekonstruktion von Pteraspis Gosseleti, Leriche, aus dem Ober- silur Nordfrankreichs, von oben gesehen. Fig. 47. Rekonstruktion von Pteraspis rostrata, Ag., aus dem Unter- devon Belgiens, Englands und Nordfrankreichs, von oben gesehen. (Alle 3 Figuren sind Orig.-Rekonstr. in 7/9 nat. Gr.) A. - Auge. Rs. = Rostrum. Sk. = Schleimkanäle. Ds. = Dorsalstachel. Sp. = Schlitz in der Cornutalplatte.

Infographic about the first prehistoric fish, whose evolution assumed the appearance of all the rest of the animal species. [QuarkXPress (.qxp); Adobe InDesign (.indd); 4960x3188]. Stock Photo

RM2NEC340–Infographic about the first prehistoric fish, whose evolution assumed the appearance of all the rest of the animal species. [QuarkXPress (.qxp); Adobe InDesign (.indd); 4960x3188].

The first fish, Devonian period, Cephalaspis lloydii and Pteraspis miller, vintage engraved illustration. Earth before man – 1886. Stock Vector

RFEW45YB–The first fish, Devonian period, Cephalaspis lloydii and Pteraspis miller, vintage engraved illustration. Earth before man – 1886.

. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. DENISON: THE CYATHASPIDIDAE 365 Occurrence.—Late Silurian (Early Ludlovian), glacial erratic of Graptolithengestein, Muntzeschen quarry, Kothen, Saxony, Germany. cep—^*-. Fig. 113. Archegonaspis schmidti, rostral view, drawn from cast of type speci- men (X 3). cep, central epitegum; lep, lateral epitegum; orb, orbit; pop, preorbital process; rep, rostral epitegum; ro, rostrum. Archegonaspis ludensis (Salter) Pteraspis ludensis Salter, 1859, Ann. Mag. Nat. Hist., (3), 4, pp. 45-47, fig. 1. Scaphaspis lu Stock Photo

RMPFWMCJ–. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. DENISON: THE CYATHASPIDIDAE 365 Occurrence.—Late Silurian (Early Ludlovian), glacial erratic of Graptolithengestein, Muntzeschen quarry, Kothen, Saxony, Germany. cep—^*-. Fig. 113. Archegonaspis schmidti, rostral view, drawn from cast of type speci- men (X 3). cep, central epitegum; lep, lateral epitegum; orb, orbit; pop, preorbital process; rep, rostral epitegum; ro, rostrum. Archegonaspis ludensis (Salter) Pteraspis ludensis Salter, 1859, Ann. Mag. Nat. Hist., (3), 4, pp. 45-47, fig. 1. Scaphaspis lu

Catalogue of the fossil fishes in the British Museum (Natural History) .. . small. Scales of caudal region,when present, numerous and rhomboidal. 160 HETEROSTRACI. Synopsis of Genera. I. Orbits enclosed in dorsal shield. Shield consisting of seven parts, fused in adult. Pteraspis (p. 160). II. Orbits forming lateral notches in dorsal shield. Shield consisting of a single plate Palcsaspis (p. 169). Shield consisting of four parts , Cyathaspis (p. 170). Genus PTERASPIS, Kner & Huxley. [R. Kner, Haidingers Naturw. Abhandlungen, vol. i. 1847, p. 165 ;emend. T. H. Huxley, Quart. Journ. Geol. Soc. v Stock Photo

RM2AJK721–Catalogue of the fossil fishes in the British Museum (Natural History) .. . small. Scales of caudal region,when present, numerous and rhomboidal. 160 HETEROSTRACI. Synopsis of Genera. I. Orbits enclosed in dorsal shield. Shield consisting of seven parts, fused in adult. Pteraspis (p. 160). II. Orbits forming lateral notches in dorsal shield. Shield consisting of a single plate Palcsaspis (p. 169). Shield consisting of four parts , Cyathaspis (p. 170). Genus PTERASPIS, Kner & Huxley. [R. Kner, Haidingers Naturw. Abhandlungen, vol. i. 1847, p. 165 ;emend. T. H. Huxley, Quart. Journ. Geol. Soc. v

Archive image from page 104 of Die stämme der wirbeltiere (1919). Die stämme der wirbeltiere diestmmederwir00abel Year: 1919 Fische (Pisces). 83 sich bei Pteraspis (mit Ausnahme von P. Gosseleti) ein beweglicher, medianer Rückenstachel eingelenkt. Ob sich eine Rückenflosse daran schloß, ist ungewiß. Vom Hinterkörper ist nur der vordere Teil besser erhalten, der mit rhombischen Schuppen besetzt war. Die Augenhöhlen waren bei Pteraspis sehr klein, bei Cyathaspis etwas größer, und standen seitlich. Diese Augenstellung in Verbindung mit der allgemeinen Gestalt des Vorderkörpers beweist, daß Pter Stock Photo

RMT3WP53–Archive image from page 104 of Die stämme der wirbeltiere (1919). Die stämme der wirbeltiere diestmmederwir00abel Year: 1919 Fische (Pisces). 83 sich bei Pteraspis (mit Ausnahme von P. Gosseleti) ein beweglicher, medianer Rückenstachel eingelenkt. Ob sich eine Rückenflosse daran schloß, ist ungewiß. Vom Hinterkörper ist nur der vordere Teil besser erhalten, der mit rhombischen Schuppen besetzt war. Die Augenhöhlen waren bei Pteraspis sehr klein, bei Cyathaspis etwas größer, und standen seitlich. Diese Augenstellung in Verbindung mit der allgemeinen Gestalt des Vorderkörpers beweist, daß Pter

. M. A. Os. Op. Vs. Fig. 44. Rekonstruktion von Pteraspis Crouchi, Lank., aus dem Unterdevon Nord- frankreichs und Englands, von der Seite gesehen, in 2/3 nat. Gr. (Orig.-Rek. auf Grundlage der Abbildungen von A. Smith Woodward, R. H. Tra- quair und M. Leriche und unter Benützung der von M. Leriche ver- öffentlichten Photographien der Originale.) M. = Mundöffnung. Vs. = Ventralschild. A. = Auge. Ds. = Dorsalschild. Os. = Augenschild. Dst. = Dorsalstachel. Cp. = Cornutalschild. Rs. = Rostrum. Indessen spricht der Besitz des Rostrums dafür, daß z. B. Pteraspis Crouchi (F.g. 44, 45) eine bodenbew Stock Photo

RMMCNPPB–. M. A. Os. Op. Vs. Fig. 44. Rekonstruktion von Pteraspis Crouchi, Lank., aus dem Unterdevon Nord- frankreichs und Englands, von der Seite gesehen, in 2/3 nat. Gr. (Orig.-Rek. auf Grundlage der Abbildungen von A. Smith Woodward, R. H. Tra- quair und M. Leriche und unter Benützung der von M. Leriche ver- öffentlichten Photographien der Originale.) M. = Mundöffnung. Vs. = Ventralschild. A. = Auge. Ds. = Dorsalschild. Os. = Augenschild. Dst. = Dorsalstachel. Cp. = Cornutalschild. Rs. = Rostrum. Indessen spricht der Besitz des Rostrums dafür, daß z. B. Pteraspis Crouchi (F.g. 44, 45) eine bodenbew

Infographic of the fish that lived during the Devonian period (416 million years ago). [QuarkXPress (.qxp); 4960x3188]. Stock Photo

RM2NECA4N–Infographic of the fish that lived during the Devonian period (416 million years ago). [QuarkXPress (.qxp); 4960x3188].

The first fish, Devonian period, Cephalaspis lloydii and Pteraspis rostratus, vintage engraved illustration. Earth before man – 1886. Stock Vector

RFEW45Y8–The first fish, Devonian period, Cephalaspis lloydii and Pteraspis rostratus, vintage engraved illustration. Earth before man – 1886.

. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. 358 FIELDIANA: GEOLOGY, VOLUME 13. Fig. 110. Cyathaspis banksi (from Kiaer, 1932); specimens in collection of Geological Survey of Great Britain (X about 3). A, dorsal shield; B, ventral shield. orb, orbit. in Archegonaspis ludensis but this is apparently in error; the speci- men to which he refers (Brit. Mus. P. 3241) is Cyathaspis banksi. Kiaer (1932, p. 22) stated that Cyathaspis had a "real dorsal spine" comparable to that of Pteraspis, but judging from his own figure (op. cit, pi. 8, fig Stock Photo

RMPFWMH8–. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. 358 FIELDIANA: GEOLOGY, VOLUME 13. Fig. 110. Cyathaspis banksi (from Kiaer, 1932); specimens in collection of Geological Survey of Great Britain (X about 3). A, dorsal shield; B, ventral shield. orb, orbit. in Archegonaspis ludensis but this is apparently in error; the speci- men to which he refers (Brit. Mus. P. 3241) is Cyathaspis banksi. Kiaer (1932, p. 22) stated that Cyathaspis had a "real dorsal spine" comparable to that of Pteraspis, but judging from his own figure (op. cit, pi. 8, fig

Catalogue of the fossil fishes in the British Museum (Natural History) .. . ?. ; lOVbodL-warcL deLefcllth.. We st, Newm an. imp. Coccosteidae. PLATE IX. Fig. Page 1. Pteraspis rostrata (Ag.); transverse section of dorsal shield, in outline.—Lower Old Red Sandstone ; Goldtops,Newport. Monmouthshire. [P. 5037.] 162 2. 2 a. Ditto ? ; ventral shield ( Scaphaspis lewisi), inferior and lateral aspects, two-thirds nat. size.—Lower OldRsd Sandstone; Kentchurch, Herefordshire. [P. 5861.] 164 3. Cyaihaspis banksi (Huxl. & Salt.); portion of dorsal shield, outer aspect, twice nat. size, showing ornament. Stock Photo

RM2AJJ577–Catalogue of the fossil fishes in the British Museum (Natural History) .. . ?. ; lOVbodL-warcL deLefcllth.. We st, Newm an. imp. Coccosteidae. PLATE IX. Fig. Page 1. Pteraspis rostrata (Ag.); transverse section of dorsal shield, in outline.—Lower Old Red Sandstone ; Goldtops,Newport. Monmouthshire. [P. 5037.] 162 2. 2 a. Ditto ? ; ventral shield ( Scaphaspis lewisi), inferior and lateral aspects, two-thirds nat. size.—Lower OldRsd Sandstone; Kentchurch, Herefordshire. [P. 5861.] 164 3. Cyaihaspis banksi (Huxl. & Salt.); portion of dorsal shield, outer aspect, twice nat. size, showing ornament.

Archive image from page 106 of Die stämme der wirbeltiere (1919). Die stämme der wirbeltiere diestmmederwir00abel Year: 1919 Fig. 46. Fig. 45. Fig. 47. Fig. 45. Rekonstruktion von Pteraspis Crouchi, Lank., aus dem Unter- devon Nordfrankreichs und Englands, von oben gesehen. Fig. 46. Rekonstruktion von Pteraspis Gosseleti, Leriche, aus dem Ober- silur Nordfrankreichs, von oben gesehen. Fig. 47. Rekonstruktion von Pteraspis rostrata, Ag., aus dem Unter- devon Belgiens, Englands und Nordfrankreichs, von oben gesehen. (Alle 3 Figuren sind Orig.-Rekonstr. in 7/9 nat. Gr.) A. - Auge. Rs. = Rostrum Stock Photo

RMT3WPA6–Archive image from page 106 of Die stämme der wirbeltiere (1919). Die stämme der wirbeltiere diestmmederwir00abel Year: 1919 Fig. 46. Fig. 45. Fig. 47. Fig. 45. Rekonstruktion von Pteraspis Crouchi, Lank., aus dem Unter- devon Nordfrankreichs und Englands, von oben gesehen. Fig. 46. Rekonstruktion von Pteraspis Gosseleti, Leriche, aus dem Ober- silur Nordfrankreichs, von oben gesehen. Fig. 47. Rekonstruktion von Pteraspis rostrata, Ag., aus dem Unter- devon Belgiens, Englands und Nordfrankreichs, von oben gesehen. (Alle 3 Figuren sind Orig.-Rekonstr. in 7/9 nat. Gr.) A. - Auge. Rs. = Rostrum

Infographics about the Devonian period of the Palaeozoic era, when a great diversity of fish appeared. [QuarkXPress (.qxp); 4842x3248]. Stock Photo

RM2NEBY3B–Infographics about the Devonian period of the Palaeozoic era, when a great diversity of fish appeared. [QuarkXPress (.qxp); 4842x3248].

. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Il ALt^oiit 576 See Pteraspis, for figure illustratiye of the internal struc- ture of shield. PalaeasterP dyeri. Meek, American Jour. Sci. Vol. 3,1872-. Pal. Ohio, Vol. 1, 1873, page 58, plate 4, fig. 2 a, part of ven- tral side of a specimen, part of disc, parts of rays, some mar- ginal and ambulacral pieces with spines, a few dorsal pieces of one ray distorted, the whole obscured by shale; 2 S, magniUed (X2) underside of part of one ray; 2 c, mag, (X2} part Stock Photo

RMPFXHNJ–. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Il ALt^oiit 576 See Pteraspis, for figure illustratiye of the internal struc- ture of shield. PalaeasterP dyeri. Meek, American Jour. Sci. Vol. 3,1872-. Pal. Ohio, Vol. 1, 1873, page 58, plate 4, fig. 2 a, part of ven- tral side of a specimen, part of disc, parts of rays, some mar- ginal and ambulacral pieces with spines, a few dorsal pieces of one ray distorted, the whole obscured by shale; 2 S, magniUed (X2) underside of part of one ray; 2 c, mag, (X2} part

Catalogue of the fossil fishes in the British Museum (Natural History) .. . nd in natural association ; and aScaphasjus-shs-iped shield occurs in the same beds as the type species.Until confirmatory evidence is obtained, we venture to regard thetransverse division of the lateral cornua in Diplaspis as accidental. Cyathaspis banksi (Huxley & Salter). [Plate IX. fig. 3.] 1856. Pteraspis banksii, Huxley & Salter, Quart. Journ. Geol. Soc.vol. xh. p. 100; pi. ii. fig. 2. PTERASPID^E. 171 1858. Pteraspis banksii, T. II. Huxley, ibid. vol. xiv. p. 274, pi. xv.1865. Cyathaspis banksii, E. R. Lankester Stock Photo

RM2AJK6JH–Catalogue of the fossil fishes in the British Museum (Natural History) .. . nd in natural association ; and aScaphasjus-shs-iped shield occurs in the same beds as the type species.Until confirmatory evidence is obtained, we venture to regard thetransverse division of the lateral cornua in Diplaspis as accidental. Cyathaspis banksi (Huxley & Salter). [Plate IX. fig. 3.] 1856. Pteraspis banksii, Huxley & Salter, Quart. Journ. Geol. Soc.vol. xh. p. 100; pi. ii. fig. 2. PTERASPID^E. 171 1858. Pteraspis banksii, T. II. Huxley, ibid. vol. xiv. p. 274, pi. xv.1865. Cyathaspis banksii, E. R. Lankester

. Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin . vollkommen in die verkalkendeSubstanz aufgenommen wurden. Aus der mikroskopischenUntersuchung namentlich von üyathaspis, Pteraspis undCephalaspiden ist es mir unzweifelhaft geworden, dass diegrossblasige Structur dieser Hautverkalkungen zur echtenKnochenbildung hinüberleitet, indem phylogenetisch erst bei derVerdickung der interpulparen Kalkwände Knochenkörperchenin diese aufgenommen werden können, da sie einen gewissenRaum beanspruchen und ihr Einschluss ohne eine gewisseIntensität der Kalkausscheidung schwer verständlic Stock Photo

RM2CJ6GB3–. Sitzungsberichte der Gesellschaft Naturforschender Freunde zu Berlin . vollkommen in die verkalkendeSubstanz aufgenommen wurden. Aus der mikroskopischenUntersuchung namentlich von üyathaspis, Pteraspis undCephalaspiden ist es mir unzweifelhaft geworden, dass diegrossblasige Structur dieser Hautverkalkungen zur echtenKnochenbildung hinüberleitet, indem phylogenetisch erst bei derVerdickung der interpulparen Kalkwände Knochenkörperchenin diese aufgenommen werden können, da sie einen gewissenRaum beanspruchen und ihr Einschluss ohne eine gewisseIntensität der Kalkausscheidung schwer verständlic

. Bulletin of the British Museum (Natural History), Geology. . PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGGD3A–. Bulletin of the British Museum (Natural History), Geology. . PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

RMRGJHFC–. Bulletin of the British Museum (Natural History), Geology. . PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

RMRGGD20–. Bulletin of the British Museum (Natural History), Geology. . PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Bulletin of the British Museum (Natural History), Geology. 4a. PTERASPIS, ACANTHODIANS and ARTHRODIRES. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGJH7X–. Bulletin of the British Museum (Natural History), Geology. 4a. PTERASPIS, ACANTHODIANS and ARTHRODIRES. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Bulletin of the British Museum (Natural History), Geology. ^*|#f. â ^f.;! PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGJHP1–. Bulletin of the British Museum (Natural History), Geology. ^*|#f. â ^f.;! PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Bulletin of the British Museum (Natural History), Geology. . ^':. mk CEPHALASPIS & PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGJHJR–. Bulletin of the British Museum (Natural History), Geology. . ^':. mk CEPHALASPIS & PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Bulletin of the British Museum (Natural History), Geology. Bull. B.M. (N.H.) Geol. 5, 7 PLATE 34. PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGJHTA–. Bulletin of the British Museum (Natural History), Geology. Bull. B.M. (N.H.) Geol. 5, 7 PLATE 34. PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Bulletin of the British Museum (Natural History), Geology. 10 15 19 20. 39 40 41 42 43 44 PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGJHCJ–. Bulletin of the British Museum (Natural History), Geology. 10 15 19 20. 39 40 41 42 43 44 PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Bulletin of the British Museum (Natural History), Geology. Bull. B.M. (N.H.) Geo!. 5, 7 PLATE 37. ORAL PLATES OF PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGJHJB–. Bulletin of the British Museum (Natural History), Geology. Bull. B.M. (N.H.) Geo!. 5, 7 PLATE 37. ORAL PLATES OF PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Bulletin of the British Museum (Natural History), Geology. Bull. B.M. {N.H.) Geol. I, 3 PLATE. PTERASPIS [SIMOPTERASPIS) LEATHENSIS White. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGKCA1–. Bulletin of the British Museum (Natural History), Geology. Bull. B.M. {N.H.) Geol. I, 3 PLATE. PTERASPIS [SIMOPTERASPIS) LEATHENSIS White. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Bulletin of the British Museum (Natural History), Geology. Bull. B.M. (N.H.) Geol. 5, 7 PLATE 33 %. PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGJHW3–. Bulletin of the British Museum (Natural History), Geology. Bull. B.M. (N.H.) Geol. 5, 7 PLATE 33 %. PTERASPIS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Chordate morphology. Morphology (Animals); Chordata. BIRKENIA. PTERASPIS Figure 5-29. Lateral views of reconstructions of fossil ognaths: A, osteostracan, B, anospid, and C, heterostrocan. (Partly after Stensio, Jorvik, and Romer) 134 • THE HEAD SKELETON OF FISHES. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm. New York, Reinhold Stock Photo

RMRJ4YYK–. Chordate morphology. Morphology (Animals); Chordata. BIRKENIA. PTERASPIS Figure 5-29. Lateral views of reconstructions of fossil ognaths: A, osteostracan, B, anospid, and C, heterostrocan. (Partly after Stensio, Jorvik, and Romer) 134 • THE HEAD SKELETON OF FISHES. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Jollie, Malcolm. New York, Reinhold

. Bulletin of the British Museum (Natural History), Geology. THE OLD RED SANDSTONE OF BROWN CLEE HILL 277 that clear, but as in the similar case of Pteraspis leathensis White (1950 : 79), there must be some uncertainty as to the relative sizes of the scales and plates owing to the possibility of water-sorting. As in the Pteraspis, however, the relative maximum sizes of plates and scales do not vary substantially from one locality to another. "iil«. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and ap Stock Photo

RMRGK099–. Bulletin of the British Museum (Natural History), Geology. THE OLD RED SANDSTONE OF BROWN CLEE HILL 277 that clear, but as in the similar case of Pteraspis leathensis White (1950 : 79), there must be some uncertainty as to the relative sizes of the scales and plates owing to the possibility of water-sorting. As in the Pteraspis, however, the relative maximum sizes of plates and scales do not vary substantially from one locality to another. "iil«. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and ap

. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. GANOIDEI. 393 the pectoral fins is the peculiar characteristic of the Pterichthys. These were in the form of two long curved spines, something like wings, covered by finely-tuberculated ganoid plates. From their form, they cannot have been of much use in swimming; but they probably, as suggested by Owen, enabled the fish to shuffle along the sandy bottom of the sea, if left dry at low water. b. Pteraspis.—In most respects this genus was not unlike Pterichthys, but it did not poss Stock Photo

RMRDKM7R–. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. GANOIDEI. 393 the pectoral fins is the peculiar characteristic of the Pterichthys. These were in the form of two long curved spines, something like wings, covered by finely-tuberculated ganoid plates. From their form, they cannot have been of much use in swimming; but they probably, as suggested by Owen, enabled the fish to shuffle along the sandy bottom of the sea, if left dry at low water. b. Pteraspis.—In most respects this genus was not unlike Pterichthys, but it did not poss

. Bulletin of the British Museum (Natural History), Geology. 70 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL Outside the Anglo-Welsh area closely related species have been found in north France and Spitsbergen, in the former the resemblance being so close as to suggest possible identity when the French fossils are better known. •:iii;-: 17.. Pteraspis crouchi Pteraspis leathensis Traquairaspis symondsi Traquairaspis pococki iPsammosteus i Limestone Cephalaspis Sandstone-cornstones Dittonian Sandstones and Cornstones with Cephalaspids Text-fig. i. Diagrammatic representation of the class Stock Photo

RMRGKCHE–. Bulletin of the British Museum (Natural History), Geology. 70 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL Outside the Anglo-Welsh area closely related species have been found in north France and Spitsbergen, in the former the resemblance being so close as to suggest possible identity when the French fossils are better known. •:iii;-: 17.. Pteraspis crouchi Pteraspis leathensis Traquairaspis symondsi Traquairaspis pococki iPsammosteus i Limestone Cephalaspis Sandstone-cornstones Dittonian Sandstones and Cornstones with Cephalaspids Text-fig. i. Diagrammatic representation of the class

. Report of the Second Norwegian Arctic expedition in the "Fram" 1898-1902 ... "Fram" Expedition. 1898-1902; Natural history; Meteorology. 1898-1902. No 33. UPPER DEVONIAN FISH REMAINS. 35 The.se nssiiiH(iti(iiis of PaiXoek are mainly of historic interest as far as we are concerned. After TiiAuii.viu'^ investigations, wliicli iiave been earned fmilier l>y my own jiroofs of tlie structure of the skeleton, it has Lieen consulei-etl certain that Psainmosteus. Drepanaspis and Pteraspis ai-e nearly related forms. Drrpanaspis, the dermal skeleton of which is knovn in most det Stock Photo

RMRDNR10–. Report of the Second Norwegian Arctic expedition in the "Fram" 1898-1902 ... "Fram" Expedition. 1898-1902; Natural history; Meteorology. 1898-1902. No 33. UPPER DEVONIAN FISH REMAINS. 35 The.se nssiiiH(iti(iiis of PaiXoek are mainly of historic interest as far as we are concerned. After TiiAuii.viu'^ investigations, wliicli iiave been earned fmilier l>y my own jiroofs of tlie structure of the skeleton, it has Lieen consulei-etl certain that Psainmosteus. Drepanaspis and Pteraspis ai-e nearly related forms. Drrpanaspis, the dermal skeleton of which is knovn in most det

. Chordate morphology. Morphology (Animals); Chordata. GEMUNDINA BOTHRIOLEPIS Figure 2-14. Restorotions of some fossil plocoderms. Pteraspis, Drepanaspis, and Birkema (Figure 2-13). Tremataspis differed from Cephalaspis in lacking the horn-like develop- ments of the head margin and in lacking fins. These genera agreed in having the head and trunk largely encased in armor. The tail was covered by scales or plates. The naso- hypophyseal duct opened on the top of the head just Ln front of the eyes, which lay near the midline. Behind the eyes were a dorsal "field" covered by small plates Stock Photo

RMRJ5224–. Chordate morphology. Morphology (Animals); Chordata. GEMUNDINA BOTHRIOLEPIS Figure 2-14. Restorotions of some fossil plocoderms. Pteraspis, Drepanaspis, and Birkema (Figure 2-13). Tremataspis differed from Cephalaspis in lacking the horn-like develop- ments of the head margin and in lacking fins. These genera agreed in having the head and trunk largely encased in armor. The tail was covered by scales or plates. The naso- hypophyseal duct opened on the top of the head just Ln front of the eyes, which lay near the midline. Behind the eyes were a dorsal "field" covered by small plates

. Bulletin of the British Museum (Natural History), Geology. 84 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL of P. leathensis with specimens of the Spitsbergen species and sent me photographs on which Text-figs. i8 and 21 are based. P. vogti attains a substantially greater size than the English species and appears to be somewhat broader and flatter with a shorter and more rounded rostrum, smaller orbital plates, and finer ornamentation. According to F0yn & Heintz (1943: 43) P. vogti is known only from the basal layers of the Ben Nevis Division, which they equate with the Dittonian.. Stock Photo

RMRGKCCR–. Bulletin of the British Museum (Natural History), Geology. 84 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL of P. leathensis with specimens of the Spitsbergen species and sent me photographs on which Text-figs. i8 and 21 are based. P. vogti attains a substantially greater size than the English species and appears to be somewhat broader and flatter with a shorter and more rounded rostrum, smaller orbital plates, and finer ornamentation. According to F0yn & Heintz (1943: 43) P. vogti is known only from the basal layers of the Ben Nevis Division, which they equate with the Dittonian..

. The Canadian record of science. Natural history. 252 Canadian Record of Science. plates ("cornua" ?) are preserved, as well as the front half or third of the ventral shield; the stria? on the ven- tral scute are symmetrical in relation to a median line passing through it; there is a detached fragment of a plate with concentric striae like the eye plate of Pteraspis ros- trata.1 There is also a large plate more strongly arched than the ventral scute, on which the stria? are not arranged with entire symmetry; it appears to be the dextral half of the dorsal plate ; it resembles the sh Stock Photo

RMRFX862–. The Canadian record of science. Natural history. 252 Canadian Record of Science. plates ("cornua" ?) are preserved, as well as the front half or third of the ventral shield; the stria? on the ven- tral scute are symmetrical in relation to a median line passing through it; there is a detached fragment of a plate with concentric striae like the eye plate of Pteraspis ros- trata.1 There is also a large plate more strongly arched than the ventral scute, on which the stria? are not arranged with entire symmetry; it appears to be the dextral half of the dorsal plate ; it resembles the sh

RMRGKCDX–. Bulletin of the British Museum (Natural History), Geology. PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL 8i irregularities seem to indicate the resumption of rapid growth after a resting period. The ornamentation in the antero-lateral marginal area of the ventral disk is often broken up into confused short lengths or tubercles (Text-fig. 9), and in the centre of this plate confused areas are also sometimes to be seen (P. 16853?).. Text-fig. 9. Pteraspis (Simopteraspis) leathensis White. External impression of ventral disk showing sensory canals, with cross-profile of internal cast at A

. Bulletin of the British Museum (Natural History), Geology. 278 THE OLD RED SANDSTONE OF BROWN CLEE HILL meets the normally disposed series at the margin almost at a right angle. It was an arrangement such as this constantly occurring in Pteraspis dixoni that led Stensio (1958 : 292) in the belief that such a pattern signified a different mode of de- velopment, to place this otherwise obvious species of Pteraspis, not only in a new genus, Penygaspis, but in a different Order, the Traquairaspida. As an irregularity it occurs occasionally in other species of pteraspids.. Protaspis (Europrotaspi Stock Photo

RMRGK082–. Bulletin of the British Museum (Natural History), Geology. 278 THE OLD RED SANDSTONE OF BROWN CLEE HILL meets the normally disposed series at the margin almost at a right angle. It was an arrangement such as this constantly occurring in Pteraspis dixoni that led Stensio (1958 : 292) in the belief that such a pattern signified a different mode of de- velopment, to place this otherwise obvious species of Pteraspis, not only in a new genus, Penygaspis, but in a different Order, the Traquairaspida. As an irregularity it occurs occasionally in other species of pteraspids.. Protaspis (Europrotaspi

. Bulletin of the British Museum (Natural History), Geology. 82 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL from the 'Passage Beds' (Psammites de Lievin) of the Pas-de-Calais (see Barrois, Pruvost, & Dubois, 1922: 180-4). Thanks to the kindness of Professor Leriche and Professor Pruvost I have been able to examine these specimens from the collections of the University of Lille. There are four dorsal shields, two of which are nearly com- plete (Text-figs. 15-17, 19), but the surface of the plates has almost disappeared and. Pteraspis [Simopteraspis) leathensis White Text-fig. 10. Im Stock Photo

RMRGKCDD–. Bulletin of the British Museum (Natural History), Geology. 82 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL from the 'Passage Beds' (Psammites de Lievin) of the Pas-de-Calais (see Barrois, Pruvost, & Dubois, 1922: 180-4). Thanks to the kindness of Professor Leriche and Professor Pruvost I have been able to examine these specimens from the collections of the University of Lille. There are four dorsal shields, two of which are nearly com- plete (Text-figs. 15-17, 19), but the surface of the plates has almost disappeared and. Pteraspis [Simopteraspis) leathensis White Text-fig. 10. Im

. Chordate morphology. Morphology (Animals); Chordata. COCCOSTEUS. GEMUNDINA BOTHRIOLEPIS Figure 2-14. Restorotions of some fossil plocoderms. Pteraspis, Drepanaspis, and Birkema (Figure 2-13). Tremataspis differed from Cephalaspis in lacking the horn-like develop- ments of the head margin and in lacking fins. These genera agreed in having the head and trunk largely encased in armor. The tail was covered by scales or plates. The naso- hypophyseal duct opened on the top of the head just Ln front of the eyes, which lay near the midline. Behind the eyes were a dorsal "field" covered by Stock Photo

RMRJ522C–. Chordate morphology. Morphology (Animals); Chordata. COCCOSTEUS. GEMUNDINA BOTHRIOLEPIS Figure 2-14. Restorotions of some fossil plocoderms. Pteraspis, Drepanaspis, and Birkema (Figure 2-13). Tremataspis differed from Cephalaspis in lacking the horn-like develop- ments of the head margin and in lacking fins. These genera agreed in having the head and trunk largely encased in armor. The tail was covered by scales or plates. The naso- hypophyseal duct opened on the top of the head just Ln front of the eyes, which lay near the midline. Behind the eyes were a dorsal "field" covered by

RMRD689R–. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. 358 FIELDIANA: GEOLOGY, VOLUME 13. Fig. 110. Cyathaspis banksi (from Kiaer, 1932); specimens in collection of Geological Survey of Great Britain (X about 3). A, dorsal shield; B, ventral shield. orb, orbit. in Archegonaspis ludensis but this is apparently in error; the speci- men to which he refers (Brit. Mus. P. 3241) is Cyathaspis banksi. Kiaer (1932, p. 22) stated that Cyathaspis had a "real dorsal spine" comparable to that of Pteraspis, but judging from his own figure (op. cit, pi. 8, fig

. Bulletin of the British Museum (Natural History), Geology. PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL 87 P. crouchi to be even more diminutive than those of P. rostrata and the slenderness and length of the branchial plate seems to support this suggestion. Locality. The specimens came from sections in a stream near 'the Lobby', Oldfield, near Chetton, 4 miles south-west of Bridgnorth. The beds are in a small area determined as stage I. g by VVickham King, who separates it by faults from the. Pteraspis crouchi Lankester Text-fig. 23. Rostrum lacking proximal end. [RP461.] Text-fig. 2 Stock Photo

RMRGKCAR–. Bulletin of the British Museum (Natural History), Geology. PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL 87 P. crouchi to be even more diminutive than those of P. rostrata and the slenderness and length of the branchial plate seems to support this suggestion. Locality. The specimens came from sections in a stream near 'the Lobby', Oldfield, near Chetton, 4 miles south-west of Bridgnorth. The beds are in a small area determined as stage I. g by VVickham King, who separates it by faults from the. Pteraspis crouchi Lankester Text-fig. 23. Rostrum lacking proximal end. [RP461.] Text-fig. 2

RMRD688X–. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. DENISON: THE CYATHASPIDIDAE 365 Occurrence.—Late Silurian (Early Ludlovian), glacial erratic of Graptolithengestein, Muntzeschen quarry, Kothen, Saxony, Germany. cep—^*-. Fig. 113. Archegonaspis schmidti, rostral view, drawn from cast of type speci- men (X 3). cep, central epitegum; lep, lateral epitegum; orb, orbit; pop, preorbital process; rep, rostral epitegum; ro, rostrum. Archegonaspis ludensis (Salter) Pteraspis ludensis Salter, 1859, Ann. Mag. Nat. Hist., (3), 4, pp. 45-47, fig. 1. Scaphaspis lu

. Bulletin of the British Museum (Natural History), Geology. 8o PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL its absence in the numerous specimens of P. rostrata (White, 1935) is due to the chances of preservation—which is rather remarkable in view of the superb state of preserva- tion of the specimens from Wayne Herbert and Trimpley. Recently a fresh examina- tion has shown that this feature is partly preserved in one of the Trimpley scales (P.17444).. Pteraspis [Simoptevaspis) leathensis White Text-fig. 5. External impression of pineal area of dorsal shield. Ammons Hill. [P-23793- X 2 Stock Photo

RMRGKCE9–. Bulletin of the British Museum (Natural History), Geology. 8o PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL its absence in the numerous specimens of P. rostrata (White, 1935) is due to the chances of preservation—which is rather remarkable in view of the superb state of preserva- tion of the specimens from Wayne Herbert and Trimpley. Recently a fresh examina- tion has shown that this feature is partly preserved in one of the Trimpley scales (P.17444).. Pteraspis [Simoptevaspis) leathensis White Text-fig. 5. External impression of pineal area of dorsal shield. Ammons Hill. [P-23793- X 2

. Bulletin of the British Museum (Natural History), Geology. THE VERTEBRATE FAUNAS OF THE LOWER OLD RED SANDSTONE OF THE WELSH BORDERS PTERASPIS LEATHENSIS White A DITTONIAN ZONE-FOSSIL BY ERROL IVOR WHITE. Pp. 49-89; P^- 5; 27 Text-figures BULLETIN OF THE BRITISH MUSEUM (NATURAL HISTORY) GEOLOGY Vol.1 No. 3 LONDON: 1950. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo

RMRGKCK6–. Bulletin of the British Museum (Natural History), Geology. THE VERTEBRATE FAUNAS OF THE LOWER OLD RED SANDSTONE OF THE WELSH BORDERS PTERASPIS LEATHENSIS White A DITTONIAN ZONE-FOSSIL BY ERROL IVOR WHITE. Pp. 49-89; P^- 5; 27 Text-figures BULLETIN OF THE BRITISH MUSEUM (NATURAL HISTORY) GEOLOGY Vol.1 No. 3 LONDON: 1950. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. A brief general account of fossil fishes : the Triassic fishes of New Jersey. Fishes, Fossil; Paleontology. Pig. 2. Cephalaspis murchisoni Egert. Silurian and Lower Devonian; Hereford- shire. Lateral aspect, restored by Dr. A. S. Woodward. X %•. Fig- 3- Pteraspis rosirata Ag. Lower Old Red Sandstone; Great Britain, view of partially restored fish. X ZA- Side TremataspiSj together with the remarkable forms described with- in recent years from the Scottish Silurian, grouped by Dr. Tra- quair under the name of Anaspida. Of the above mentioned forms, only the genus Cephalaspis appears to have be Stock Photo

RMRH473P–. A brief general account of fossil fishes : the Triassic fishes of New Jersey. Fishes, Fossil; Paleontology. Pig. 2. Cephalaspis murchisoni Egert. Silurian and Lower Devonian; Hereford- shire. Lateral aspect, restored by Dr. A. S. Woodward. X %•. Fig- 3- Pteraspis rosirata Ag. Lower Old Red Sandstone; Great Britain, view of partially restored fish. X ZA- Side TremataspiSj together with the remarkable forms described with- in recent years from the Scottish Silurian, grouped by Dr. Tra- quair under the name of Anaspida. Of the above mentioned forms, only the genus Cephalaspis appears to have be

. Bulletin of the British Museum (Natural History), Geology. PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL 77 This shield, comprising the rostrum, pineal plate, orbitals, dorsal disk, dorsal spine, branchial and cornual plates, is known in detail except for the extremity of the spine. The length of the adult dorsal shield as indicated by the largest specimens from Ammons Hill (Text-figs. 3, 4, &c.) reaches 5 cm. without the spine, and the Leath specimens (Text-fig. 2) are similar in size ; but the Porch Brook shields are only three- quarters as large (Text-figs. 6-7) and seem to have Stock Photo

RMRGKCH6–. Bulletin of the British Museum (Natural History), Geology. PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL 77 This shield, comprising the rostrum, pineal plate, orbitals, dorsal disk, dorsal spine, branchial and cornual plates, is known in detail except for the extremity of the spine. The length of the adult dorsal shield as indicated by the largest specimens from Ammons Hill (Text-figs. 3, 4, &c.) reaches 5 cm. without the spine, and the Leath specimens (Text-fig. 2) are similar in size ; but the Porch Brook shields are only three- quarters as large (Text-figs. 6-7) and seem to have

. Bulletin of the British Museum (Natural History), Geology. THE OLD RED SANDSTONE OF BROWN CLEE HILL 253 The dorsal spine was clearly short and deep (Text-fig. 4 ; P. 32243) but although the specimen figured has little missing, the tip is rubbed and may have been some- what more pointed. The orbitals are rather short but wide, with their medial extensions usually in full contact with the very wide and short pineal plate (PI. 33, figs. 1, 2 ; PI. 34, figs. 1, 3, 4)-. Fig. Pteraspis (Pteraspis) dairy'dinglensis sp. nov. Imperfect dorsal shield. Hopton Brook 4. P.42364. X 1-2. The branchial open Stock Photo

RMRGK0G4–. Bulletin of the British Museum (Natural History), Geology. THE OLD RED SANDSTONE OF BROWN CLEE HILL 253 The dorsal spine was clearly short and deep (Text-fig. 4 ; P. 32243) but although the specimen figured has little missing, the tip is rubbed and may have been some- what more pointed. The orbitals are rather short but wide, with their medial extensions usually in full contact with the very wide and short pineal plate (PI. 33, figs. 1, 2 ; PI. 34, figs. 1, 3, 4)-. Fig. Pteraspis (Pteraspis) dairy'dinglensis sp. nov. Imperfect dorsal shield. Hopton Brook 4. P.42364. X 1-2. The branchial open

. Early Devonian fishes from Utah : Heteroostraci. Fishes, Fossil; Paleontology -- Devonian; Paleontology -- Utah. 338 FIELDIANA: GEOLOGY, VOLUME 11. Fig. 75. Protaspis dorfi; crushed dorsal shield, PF 868 (X 1). essentials with that of P. cf. bucheri, described on page 322. A new restoration of P. (P.) dorfi, based on PF 868, is given in figure 76. The pattern of the dorsal sensory canals agrees with that of Pteraspis. Protaspis (Protaspis) cf. bucheri (Bryant) A dorsal shield (figs. 77, 78), little crushed, and complete except postero-medially, is doubtfully referred to this species. It was Stock Photo

RMREA2TN–. Early Devonian fishes from Utah : Heteroostraci. Fishes, Fossil; Paleontology -- Devonian; Paleontology -- Utah. 338 FIELDIANA: GEOLOGY, VOLUME 11. Fig. 75. Protaspis dorfi; crushed dorsal shield, PF 868 (X 1). essentials with that of P. cf. bucheri, described on page 322. A new restoration of P. (P.) dorfi, based on PF 868, is given in figure 76. The pattern of the dorsal sensory canals agrees with that of Pteraspis. Protaspis (Protaspis) cf. bucheri (Bryant) A dorsal shield (figs. 77, 78), little crushed, and complete except postero-medially, is doubtfully referred to this species. It was

. Allgemeine Zoologie und Abstammungslehre. Evolution; Zoology. 216 VI. Kapitel. den ältesten paläozoischen Fischen die verschiedensten Hartgebilde gleichzeitig antreffen. Wir finden bei den Acanthodiern im Silur und Devon Schuppen (195, J), welche eine unverkennbare Aehnlichkeit mit den Ganoidschuppen (D) haben, die auch schon im Devon vorhanden sind. Ferner große Knochenplatten, die mit Placoidschuppen besetzt sind (H), bei Heterostracen {Psammosteus, Pteraspis) und Coelacanthiden (Macropoma) und echte Dipnoidschuppen (G) zu derselben Zeit. Dazu noch Bedeckung mit großen Knochenplatten bei d Stock Photo

RMRPR8FY–. Allgemeine Zoologie und Abstammungslehre. Evolution; Zoology. 216 VI. Kapitel. den ältesten paläozoischen Fischen die verschiedensten Hartgebilde gleichzeitig antreffen. Wir finden bei den Acanthodiern im Silur und Devon Schuppen (195, J), welche eine unverkennbare Aehnlichkeit mit den Ganoidschuppen (D) haben, die auch schon im Devon vorhanden sind. Ferner große Knochenplatten, die mit Placoidschuppen besetzt sind (H), bei Heterostracen {Psammosteus, Pteraspis) und Coelacanthiden (Macropoma) und echte Dipnoidschuppen (G) zu derselben Zeit. Dazu noch Bedeckung mit großen Knochenplatten bei d

. Bulletin of the British Museum (Natural History), Geology. . Pteraspis (Pteraspis) dairydinglensis sp. nov. Fig. 3. Imperfect dorsal shield. The holotype. Dairy Dingle. P.29936. Fig. 4. Dorsal spine. Derrington Rea Bridge. P.42005. x i-6. X i-2. than in life. The region around the socket of the dorsal spine is naturally thick and thus reinforced does not crush so readily and still retains much of its original shape, whereas the rostrum is flattened. As preserved the total length, including the socket, is 9-3 cm., the breadth 6-2 cm. flat at the maximum (just in front of the branchial opening Stock Photo

RMRGK0GJ–. Bulletin of the British Museum (Natural History), Geology. . Pteraspis (Pteraspis) dairydinglensis sp. nov. Fig. 3. Imperfect dorsal shield. The holotype. Dairy Dingle. P.29936. Fig. 4. Dorsal spine. Derrington Rea Bridge. P.42005. x i-6. X i-2. than in life. The region around the socket of the dorsal spine is naturally thick and thus reinforced does not crush so readily and still retains much of its original shape, whereas the rostrum is flattened. As preserved the total length, including the socket, is 9-3 cm., the breadth 6-2 cm. flat at the maximum (just in front of the branchial opening

. Bulletin of the British Museum (Natural History), Geology. PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL 79 Isolated scales (Text-figs. 10-14; PI. 5, Figs. 3-5) are plentiful at both Porch Brook and Leath Stream, but only the former are weU preserved. The same types of scales are found as in P. rostrata (White, 1935: 413, text-figs. 56-62, pi. 27) and the ano- malous double scales are well represented. The ordinary flank-scales tend to be rather less regularly diamond-shaped and the anterior ridge-scales less pointed than in the. Text-fig. 4. Pteraspis {Simopteraspis) leathensis White. Stock Photo

RMRGKCEG–. Bulletin of the British Museum (Natural History), Geology. PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL 79 Isolated scales (Text-figs. 10-14; PI. 5, Figs. 3-5) are plentiful at both Porch Brook and Leath Stream, but only the former are weU preserved. The same types of scales are found as in P. rostrata (White, 1935: 413, text-figs. 56-62, pi. 27) and the ano- malous double scales are well represented. The ordinary flank-scales tend to be rather less regularly diamond-shaped and the anterior ridge-scales less pointed than in the. Text-fig. 4. Pteraspis {Simopteraspis) leathensis White.

$. Bulletin of the British Museum (Natural History), Geology. . Text-figs. 19-22. Restorations of dorsal shields of species of Pteraspis (Simopteraspis). Fig. ig. P. {S). gosseleti'Lenche; X 2. Fig. 20. P. (S). leaihen- sis White; x ij. Fig. 21. P. (5). w^/i Kiaer; x ij. Fig. 22. P. (S). primaeva Kiaer; x 2.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH) Stock Photo$

RMRGKCB5–. Bulletin of the British Museum (Natural History), Geology. . Text-figs. 19-22. Restorations of dorsal shields of species of Pteraspis (Simopteraspis). Fig. ig. P. {S). gosseleti'Lenche; X 2. Fig. 20. P. (S). leaihen- sis White; x ij. Fig. 21. P. (5). w^/i Kiaer; x ij. Fig. 22. P. (S). primaeva Kiaer; x 2.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. British Museum (Natural History). London : BM(NH)

. Bulletin of the British Museum (Natural History), Geology. 78 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL The branchial plates are long, and the cornual plates small and narrow in the Ammons Hill specimens (Text-figs. 3, 4), but rather wider and more triangular in those from Porch Brook (Text-fig. 7; PL 5, Fig. 2). Text-fig. 7 shows a most remarkable specimen, the earliest instance of teratology in a vertebrate animal that I know. It is the left side of a blind monster of the small. Text-fig. 3. Pteraspis (Simopteraspis) leathensis White. External impres- sion of complete dorsal shie Stock Photo

RMRGKCGP–. Bulletin of the British Museum (Natural History), Geology. 78 PTERASPIS LEATHENSIS WHITE, A DITTONIAN ZONE-FOSSIL The branchial plates are long, and the cornual plates small and narrow in the Ammons Hill specimens (Text-figs. 3, 4), but rather wider and more triangular in those from Porch Brook (Text-fig. 7; PL 5, Fig. 2). Text-fig. 7 shows a most remarkable specimen, the earliest instance of teratology in a vertebrate animal that I know. It is the left side of a blind monster of the small. Text-fig. 3. Pteraspis (Simopteraspis) leathensis White. External impres- sion of complete dorsal shie

. Bulletin of the British Museum (Natural History), Geology. 248 THE OLD RED SANDSTONE OF BROWN CLEE HILL Pteraspis (Pteraspis) rostrata var. waynensis White (Text-fig. i) Jubilee Brook i. Two rostra with part of orbitals, etc. attached (P.30053, P.30056). The inner anterior borders of the orbitals are concave and the medial extensions meet the pineal plate. The second specimen is 27 cm. in length with a maximum breadth of 2-4 cm. (Text-fig. 1). (250 ft. above " Psammosteus " Limestone.). Please note that these images are extracted from scanned page images that may have been digitall Stock Photo

RMRGK0JG–. Bulletin of the British Museum (Natural History), Geology. 248 THE OLD RED SANDSTONE OF BROWN CLEE HILL Pteraspis (Pteraspis) rostrata var. waynensis White (Text-fig. i) Jubilee Brook i. Two rostra with part of orbitals, etc. attached (P.30053, P.30056). The inner anterior borders of the orbitals are concave and the medial extensions meet the pineal plate. The second specimen is 27 cm. in length with a maximum breadth of 2-4 cm. (Text-fig. 1). (250 ft. above " Psammosteus " Limestone.). Please note that these images are extracted from scanned page images that may have been digitall

. Bulletin de la Société belge de géologie, de paléontologie et d'hydrologie. Geology; Paleontology. 354 AD. KEMNA. — LES RÉGENTES DÉCOUVERTES latérale. Tl y aurait donc eu, malgré l'absence ou le peu d'importance des cassures, une déformation assez considérable.. V C Fig. 2. — Pteraspis rostrala vu de profil et du côté gauche ; ENVIRON UN TIERS DE GRANDEUR NATURELLE.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Société Stock Photo

RMRGR68B–. Bulletin de la Société belge de géologie, de paléontologie et d'hydrologie. Geology; Paleontology. 354 AD. KEMNA. — LES RÉGENTES DÉCOUVERTES latérale. Tl y aurait donc eu, malgré l'absence ou le peu d'importance des cassures, une déformation assez considérable.. V C Fig. 2. — Pteraspis rostrala vu de profil et du côté gauche ; ENVIRON UN TIERS DE GRANDEUR NATURELLE.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Société

RMRD94CF–. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Il ALt^oiit 576 See Pteraspis, for figure illustratiye of the internal struc- ture of shield. PalaeasterP dyeri. Meek, American Jour. Sci. Vol. 3,1872-. Pal. Ohio, Vol. 1, 1873, page 58, plate 4, fig. 2 a, part of ven- tral side of a specimen, part of disc, parts of rays, some mar- ginal and ambulacral pieces with spines, a few dorsal pieces of one ray distorted, the whole obscured by shale; 2 S, magniUed (X2) underside of part of one ray; 2 c, mag, (X2} part

. Bulletin of the British Museum (Natural History), Geology. . Fig. 1. Pteraspis (Pteraspis) rostrata var. waynensis White. Rostrum with part of left orbital plate. Jubilee Brook 1. P.30056. x 1-5. Fig. 2. Pteraspis (Pteraspis) rostrata var. trimpleyensis White. Anterior part of dorsal shield, in impression. Bouldon Ford. P.29955. x I-5- Pteraspis (Pteraspis) rostrata var. trimpleyensis White (PI. 34, fig. 5 ; PI. 35, figs. 1, 2 ; Text-fig. 2) Bouldon Ford. External impression of part of dorsal shield with abnormal sensory canals (P.29955 ; Text-fig. 2) and other fragments. (50 ft. above &quot Stock Photo

RMRGK0HP–. Bulletin of the British Museum (Natural History), Geology. . Fig. 1. Pteraspis (Pteraspis) rostrata var. waynensis White. Rostrum with part of left orbital plate. Jubilee Brook 1. P.30056. x 1-5. Fig. 2. Pteraspis (Pteraspis) rostrata var. trimpleyensis White. Anterior part of dorsal shield, in impression. Bouldon Ford. P.29955. x I-5- Pteraspis (Pteraspis) rostrata var. trimpleyensis White (PI. 34, fig. 5 ; PI. 35, figs. 1, 2 ; Text-fig. 2) Bouldon Ford. External impression of part of dorsal shield with abnormal sensory canals (P.29955 ; Text-fig. 2) and other fragments. (50 ft. above &quot

. Bulletin of the British Museum (Natural History), Geology. EXPLANATION OF PLATE 5 Pteraspis [Simopteraspis] leathensis White Fig. I. Flattened fragmentary dorsal shield showing complete rostral and pineal plates and part of both orbitals and median disk. [B.U.487. x 4.] Fig. 2. Flattened left posterior region of dorsal shield showing cornual plate and part of branchial plate and dorsal disk. [B.U.485. x 4.] Fig. 3. Posterior ridge-scale lacking posterior (top) end and area of overlap. [B.U.4946. X 16 approx.] Fig. 4. Left double flank-scale. Area of overlap missing. [B.U.494a. X 16 approx.] Stock Photo

RMRGKCAC–. Bulletin of the British Museum (Natural History), Geology. EXPLANATION OF PLATE 5 Pteraspis [Simopteraspis] leathensis White Fig. I. Flattened fragmentary dorsal shield showing complete rostral and pineal plates and part of both orbitals and median disk. [B.U.487. x 4.] Fig. 2. Flattened left posterior region of dorsal shield showing cornual plate and part of branchial plate and dorsal disk. [B.U.485. x 4.] Fig. 3. Posterior ridge-scale lacking posterior (top) end and area of overlap. [B.U.4946. X 16 approx.] Fig. 4. Left double flank-scale. Area of overlap missing. [B.U.494a. X 16 approx.]

. Bulletin of the British Museum (Natural History), Geology. 220 A NEW TROCHILISCUS (CHAROPHYTA) Borders. Pteraspis leathensis White, a Dittonian Zone-fossil. Bull. Brit. Mus. {Nat. Hist.), London (Geol.) 1, 3: 51-89, pi. 5. Wood, R. D. 1947. Characeae of the Put-in-Bay Region of Lake Erie (Ohio). Ohio J. Sci., Columbus, 47: 240-258, pis. 1-4. Woods, H. 1947. Palaeontology Invertebrate. 8th ed. 477 pp., 221 figs. Cambridge. WoRSDELL, W. C. 1916. The Principles of Plant Teratology, 2. xvi + 296 pp., pis. 26-53, 155 figs. Ray Soc., London. Zych, W. 1927. Old-Red de la Podolie. Trav. Serv. Geol. Stock Photo

RMRGK0MW–. Bulletin of the British Museum (Natural History), Geology. 220 A NEW TROCHILISCUS (CHAROPHYTA) Borders. Pteraspis leathensis White, a Dittonian Zone-fossil. Bull. Brit. Mus. {Nat. Hist.), London (Geol.) 1, 3: 51-89, pi. 5. Wood, R. D. 1947. Characeae of the Put-in-Bay Region of Lake Erie (Ohio). Ohio J. Sci., Columbus, 47: 240-258, pis. 1-4. Woods, H. 1947. Palaeontology Invertebrate. 8th ed. 477 pp., 221 figs. Cambridge. WoRSDELL, W. C. 1916. The Principles of Plant Teratology, 2. xvi + 296 pp., pis. 26-53, 155 figs. Ray Soc., London. Zych, W. 1927. Old-Red de la Podolie. Trav. Serv. Geol.

. Bulletin de la SociÃ©tÃ© belge de gÃ©ologie, de palÃ©ontologie et d'hydrologie. Geology; Paleontology. 18 AD. KEMNA. â LES RÃCENTES DÃCOUVERTES la longueur beaucoup plus grande chez Pteraspis Crouchi; et le dessin nous apprend que cet allongement se fait par addition de paquets de stries. 11 semble donc que la forme primitive soit Pteraspis roslrata et que l'allongement rostral de Pteraspis Crouchi soit une modification secondaire. Dorsalement en arriÃ¨re, la piÃ¨ce rostrale s'insinue entre les orbitaires pour arriver au contact avec la mÃ©diane dorsale; ce bord postÃ©rieur forme un V debout Stock Photo

RMRGRWY1–. Bulletin de la SociÃ©tÃ© belge de gÃ©ologie, de palÃ©ontologie et d'hydrologie. Geology; Paleontology. 18 AD. KEMNA. â LES RÃCENTES DÃCOUVERTES la longueur beaucoup plus grande chez Pteraspis Crouchi; et le dessin nous apprend que cet allongement se fait par addition de paquets de stries. 11 semble donc que la forme primitive soit Pteraspis roslrata et que l'allongement rostral de Pteraspis Crouchi soit une modification secondaire. Dorsalement en arriÃ¨re, la piÃ¨ce rostrale s'insinue entre les orbitaires pour arriver au contact avec la mÃ©diane dorsale; ce bord postÃ©rieur forme un V debout

. Bulletin de la SociÃ©tÃ© belge de gÃ©ologie, de palÃ©ontologie et d'hydrologie. Geology; Paleontology. 16 AD. KEMNA. â LES RÃCENTES DÃCOUVERTES LiÃ©vin ont donnÃ© les plaques cornutales encore inconnues; elles sont fort Ã©troites et ne montrent pas la perforation pour la sortie de l'eau, trÃ¨s nette dans l'autre espÃ¨ce.. Fig. 1. â Pteraspis Crouchi, rÃ©duit presque de moitiÃ©; restauration Leriche, 1903. 15. â Utilisation morphologique des dessins superficiels. â L'Ã©lÃ©ment essen- tiel de la carapace est le tubercule der- mique calcifiÃ©. Chez Lanarkia, il est constituÃ© uniquement par une Stock Photo

RMRGRWYC–. Bulletin de la SociÃ©tÃ© belge de gÃ©ologie, de palÃ©ontologie et d'hydrologie. Geology; Paleontology. 16 AD. KEMNA. â LES RÃCENTES DÃCOUVERTES LiÃ©vin ont donnÃ© les plaques cornutales encore inconnues; elles sont fort Ã©troites et ne montrent pas la perforation pour la sortie de l'eau, trÃ¨s nette dans l'autre espÃ¨ce.. Fig. 1. â Pteraspis Crouchi, rÃ©duit presque de moitiÃ©; restauration Leriche, 1903. 15. â Utilisation morphologique des dessins superficiels. â L'Ã©lÃ©ment essen- tiel de la carapace est le tubercule der- mique calcifiÃ©. Chez Lanarkia, il est constituÃ© uniquement par une

. Bulletin de la SociÃ©tÃ© belge de gÃ©ologie, de palÃ©ontologie et d'hydrologie. Geology; Paleontology. Fig. 1. â Pteraspis Crouchi, rÃ©duit presque de moitiÃ©; restauration Leriche, 1903. 15. â Utilisation morphologique des dessins superficiels. â L'Ã©lÃ©ment essen- tiel de la carapace est le tubercule der- mique calcifiÃ©. Chez Lanarkia, il est constituÃ© uniquement par une Ã©pine saillante. Les CoelolÃ©pidÃ©s y ont ajoutÃ© une partie basilaire; dans les deux groupes, ces Ã©lÃ©ments restent distincts. Chez les PtÃ©raspidÃ©s, ils ont confluÃ© en lignes et en grandes plaques par leur partie b Stock Photo

RMRGRWY7–. Bulletin de la SociÃ©tÃ© belge de gÃ©ologie, de palÃ©ontologie et d'hydrologie. Geology; Paleontology. Fig. 1. â Pteraspis Crouchi, rÃ©duit presque de moitiÃ©; restauration Leriche, 1903. 15. â Utilisation morphologique des dessins superficiels. â L'Ã©lÃ©ment essen- tiel de la carapace est le tubercule der- mique calcifiÃ©. Chez Lanarkia, il est constituÃ© uniquement par une Ã©pine saillante. Les CoelolÃ©pidÃ©s y ont ajoutÃ© une partie basilaire; dans les deux groupes, ces Ã©lÃ©ments restent distincts. Chez les PtÃ©raspidÃ©s, ils ont confluÃ© en lignes et en grandes plaques par leur partie b

. Bulletin de la SociÃ©tÃ© belge de gÃ©ologie, de palÃ©ontologie et d'hydrologie. Geology; Paleontology. V C Fig. 2. â Pteraspis rostrala vu de profil et du cÃ´tÃ© gauche ; ENVIRON UN TIERS DE GRANDEUR NATURELLE.. piÃ¨ce rostrale; O orbite; D bouclier dorsal avec S Ã©pine; V bouclier ventral; C piÃ¨ce latÃ©rale ou cornue avec B ouverture par laquelle sort l'eau ayant servi Ã la respiration. Sur la ligne mÃ©diane entre les deux piÃ¨ces orbitaires, derriÃ¨re le rostre et devant le bouclier dorsal, une ouverture (Åil pinÃ©al?). Dans la vue de profil, derriÃ¨re la rÃ©gion des boucliers, quelques r Stock Photo

RMRGR680–. Bulletin de la SociÃ©tÃ© belge de gÃ©ologie, de palÃ©ontologie et d'hydrologie. Geology; Paleontology. V C Fig. 2. â Pteraspis rostrala vu de profil et du cÃ´tÃ© gauche ; ENVIRON UN TIERS DE GRANDEUR NATURELLE.. piÃ¨ce rostrale; O orbite; D bouclier dorsal avec S Ã©pine; V bouclier ventral; C piÃ¨ce latÃ©rale ou cornue avec B ouverture par laquelle sort l'eau ayant servi Ã la respiration. Sur la ligne mÃ©diane entre les deux piÃ¨ces orbitaires, derriÃ¨re le rostre et devant le bouclier dorsal, une ouverture (Åil pinÃ©al?). Dans la vue de profil, derriÃ¨re la rÃ©gion des boucliers, quelques r

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