TERTIARY ANIMALS. 



531 



as the ancestor of the Ungulates, or hoofed animals, but with almost 

 equal right may be claimed as the ancestor of other orders. It was 

 five- toed, each toe provided with a flat nail, which was neither claw 

 nor hoof, but between the two. It had bunodont molars, a full com- 

 plement of unmodified teeth, and foot-bones. It was, therefore, prob- 

 ably omnivorous in habit. Cope has described nine species partly from 

 this horizon and partly from the previous. They were about the size 

 of a sheep, or perhaps a little larger. The Corypliodon was a genus of 

 large animals, of very generalized structure, uniting the characters of 

 the more generalized Ungulates, such as Tapirs, with those of the more 

 generalized Carnivores, such as Bears. They were five-toed Ungulates 

 with full number of unmodified foot-bones, and a tread somewhat like 

 that of an Elephant. Eight or ten species of Coryphodontidas have 

 been described, varying in size from that of a Tapir to that of an ox or 

 larger (Fig. 910). 



Fig. 910. — Coryphodon 



(after Marsh): A, Head, showing form of the brain, x J; B, Hind- 

 foot; C, Fore-foot, x $. 



In the same beds are found the remains of what is believed to be 

 the earliest progenitors of the liorse family, viz., the Eohippus (dawn- 

 horse). This was a small animal about the size of the fox, with three 



