. Cope papers, 1871-[1897. Zoology; Paleontology. TJg Extinct American Rhinoceroses and their Allies. [December, The first appearance of dermal horns was apparently in a pair placed transversely on the nasal bones, in species of Eocene LophiodoiitidcB, of the genus Colonoceras. The same character has been observed by Duvernoy in species of the Lower Mio- cene, which belong to the true RJdnoceridce, and which Marsh has called DiceratJierium. This genus appears to have terminated the line exhibiting this structure, and the family in North Amer- ica remained without horn. As we have seen, the ty
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. Cope papers, 1871-[1897. Zoology; Paleontology. TJg Extinct American Rhinoceroses and their Allies. [December, The first appearance of dermal horns was apparently in a pair placed transversely on the nasal bones, in species of Eocene LophiodoiitidcB, of the genus Colonoceras. The same character has been observed by Duvernoy in species of the Lower Mio- cene, which belong to the true RJdnoceridce, and which Marsh has called DiceratJierium. This genus appears to have terminated the line exhibiting this structure, and the family in North Amer- ica remained without horn. As we have seen, the types possess- ing the median horn arose in Europe, in the Ceratorhinus schleier- macheri of the Middle Miocene, and still survives. It may be observed in conclusion, that a successive increase of size in the species of this line has taken place in North America with the advance of geologic time. Thus, their probable ances- tors of the genus Hyrachyiis, were the least of all. The Acera- *>•*'-> '^^"^^S^^ "**^'^. *^?r«. 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.. Cope, E. D. (Edward Drinker), 1840-1897. Philadelphia, etc.