522 



THE WASATCH AND BEIDGER FAUN^. 



border of the crown. The inferior premolars differ from the true molars. 

 Their crowns form a V, with the apex outward, and a short heel behind it 

 with a more or less median keel, and increasing- in transverse width in the 



Fig. 23. — Protile view of skull of Coryphodon clephaniopus, from New Mexico, 5th nat. size. From Report' 

 of Lieut. G. M. Wheeler to Chief of Engineers, 187.5, \t\. v. 



posterior teeth. The true molars support two transverse crests, each of 

 which may send obliquely inward from its external extremity a low ridge. 

 The anterior of these ridges is the best developed, and is always present. 



Fig. 24.— Superior surface of skull of Cnryphoihrn eJepTiantopus, above figured, §th uat. size. From final 

 report of Lieut. G. M. Wheeler, vol. iv, pt. ii, 1877. 



Frontal and parietal regions flat, bounded by separated temporal 

 ridges. Feet short, plantigrade. Digits 5-5, with short, wide ungues. 

 Neck and tail of medium length. 



More or less perfect specimens of one hundred and fifty individuals of 



