. Elements of comparative anatomy. Anatomy, Comparative. Pig. 268. Skeleton of the manus of various Mammals. I Man. II Dog. Ill Pig. IV Ox. V Tapir. VI Horse. r Radius, u Ulna, a Scaphoid, b Lunar. c Cuneiform, d Trapezium, e Trapezoid. / Magnum, g Uncinate, p Pisiform. either case the pollex is absent, and it is not functional even in the digitigrade carnivora (Fig. 268, II). Of the remaining digits, however, the third and fourth are so greatly developed in the Artiodactyla (III IV), that the other two (2 and 5) often do not touch the ground (Suina, Moschidas). The fifth finger is next lost,
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. Elements of comparative anatomy. Anatomy, Comparative. Pig. 268. Skeleton of the manus of various Mammals. I Man. II Dog. Ill Pig. IV Ox. V Tapir. VI Horse. r Radius, u Ulna, a Scaphoid, b Lunar. c Cuneiform, d Trapezium, e Trapezoid. / Magnum, g Uncinate, p Pisiform. either case the pollex is absent, and it is not functional even in the digitigrade carnivora (Fig. 268, II). Of the remaining digits, however, the third and fourth are so greatly developed in the Artiodactyla (III IV), that the other two (2 and 5) often do not touch the ground (Suina, Moschidas). The fifth finger is next lost, so that the third and fourth only are well-developed, and the second forms a mere appendage (Anoplotherium). The third and fourth fingers become still larger when their two metacarpals are fused together (IV), while the second and fifth fingers become rudi- mentary (Oxen, Sheep, Deer, etc.). The Perissodactyle series also begins with the four-fingered form, but in them one finger ouly (the third) is markedly larger (Tapir) (V). When the fifth, which is already the smallest, disappears (Paiaeotherium), the second and fourth are attached to the third in the form of appendages 2 i 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.. Gegenbaur, C. (Carl), 1826-1903; Bell, F. J. (Francis Jeffrey), 1855-1924; Lankester, E. Ray (Edwin Ray), Sir, 1847-1929. London, Macmillan and Co.