438 



UNGULATA 



1846 from a fragment of a jaw from the London Clay. Other 

 remains were afterwards discovered in France, and lately in great 

 abundance, indicating many species from the size of a Tapir to that 

 of a Rhinoceros, in the Lower and Middle Eocenes of New Mexico 

 and Wyoming in the United States. Coryphodon had forty-four 

 teeth ; the canines of both jaws were large and sharp pointed, 

 and the molars had strongly pronounced oblique ridges. The 

 general proportions were those of a Bear, but the tail was of 

 moderate length, and the feet short and wide. The femur had 

 a third trochanter ; and the cranium was devoid of protuberances. 



FIG. 191. Palatal aspect of the cranium of Coryphodon hamatus, from the Wasatch Eocene of 

 New Mexico. f natural size. (After Cope.) 



The genus should be regarded as the type of a distinct family 

 Coryphodontidce. 



Suborder CONDYLARTHRA. 



The term Condylarthra has been proposed by Professor Cope 

 for a number of generalised and mostly comparatively small Ungu- 

 lates, which were probably allied both to the Perissodactyla and 

 Artiodactyla, but present characters separating them from those 

 divisions as commonly defined. In the structure of the carpus 

 and tarsus these forms (which are chiefly known to us from 

 the Eocene of the United States) come nearer to the Hyracoidea 

 than to any other existing type. As a rule they have the full 

 dental formula ; the molars are brachydont, generally bunodont, 

 and in many instances also tritubercular ; while the premolars are 

 always simpler than the molars. 



The humerus is quite peculiar among Ungulates in having an 



