DINOCEEATA. 593 



The posterior molar has a wide floor extending from the posterior or 

 straight transverse crest, to the cingulum This crest is low, and has a low 

 tubercle near its apex behind The other molars have strong fore and aft 

 cingula, but none at the ends. The worn surfaces are first V-shaped, later 

 arrow-shaped. The first premolar has a curved outer crest and an inner 



conic tubercle. 



Measurements. 



ii. 



Diameter of occipital foramen and condyles 092 



From exterior end condyle to external border of mastoid 058 



From exterior end condyle to post-glenoid process 053 



Width of skull at glenoid surface between post-alisphenoid foramina 29'2 



Width of skull at glenoid surfaces between post-alisphenoid foramina 040 



Width of basioccijntal anteriorly 015 



Trans viTse diameter of last npper molar 045 



Transverse diameter of third premolar 029 



Length of molar series 163 



Found by the writer in the Bridger formation of South Bitter Creek, 

 Wyoming, in the Mammoth Buttes of the Washakie Basin. 



? UlNTATHEEIUM sp. 



Uintafheriuvi sp., Cope, Annual Report U. S. Geol. Surv. Terrs., 1872 (1873), p. 582. 



Plates xxxiv, xxxv. 



A part of a large skeleton of a species of the Dmocerata was found 

 by myself lying on a plateau of the Mammoth Buttes, Wyoming. In the 

 absence of any part of the cranium, I have been unable to indentify it 

 either as to genus or species. A cervical vertebra preserved, is so much 

 more robust than that of Eobasileus pressicornis, that I originally referred 

 the species to Uintatherium, in accordance with the descriptions of the coi-re- 

 sponding vertebrae of the genus given by Marsh. It is the belief of Messrs. 

 Scott, Spier, and Osborne that the cervical vertebrae oi Loxolophodon are not 

 as much abbreviated as in Eohasileus, so it becomes possible that the 

 present animal is a species of the former genus. As the Princeton paleon- 

 tologists have, however, described some species of suj^posed Uintatherium from 

 the same neighborhood, ( f/! leidianum and U. princeps), the present specimen 

 may belong to one of these. The description and figures are given to 

 elucidate the characters of the suborder. 



The species is one of medium size in the order, but was absolutely 



larger than the Indian rhinoceros. 

 38 



