62 



Dl NOCERATA. 



A. Cervical vertebra? long ; median horn-like processes an- 



terior to the orbit ; nasal tuberosities do not overhang 

 the nasal tips. 



{a) Last molar, with or without a tubercle, occupying 

 the entrance of the valley between the lobes, 

 and but one on posterior basal ridge. Tem- 

 poral fossEe not continued be3^ond the base of 

 the parietal processes. Occipital condyles pro- 

 jecting Uiiitathcrunn. 



{b) Last molar never has a tubercle at entrance of 

 valley, and has two on posterior basal ridge. 

 Temporal fossae continued verv far back ; con- 

 dyles sessile Dinoceras. 



B. Cervical vertebrae short ; median horn-like processes di- 



rectly over the orbit ; nasal tuberosities overhang the 

 entire tips LoxolopJiodon. 



Synopsis of species of 



UINTATHERIUM. 



A. With a tubercle occupying the entrance of the valley 



between the lobes of the last upper molar., f/'. robiistum. 



B. No tubercle at the entrance of the vallev. 



{a) Nasals divided by a deep groove ; slender zygo- 

 matic arch ; dorsal vertebrje compressed. 



U. Lcidiaiimn. 



{b) No nasal groove ; stout zygomatic arch ; dorsal 

 vertebrce subcylindi-ica' U. priiiceps. 



UINTATHERIUM. 



Leidy, Proc. Ac. Nat. Sc, 1872, p. 169.— Cont. to Ext. Vert. Faun, of Western 

 Territories, p. 93. — Cope, Hayden's Survej% 1872, p. 580, etc. 



Skull broader proportionally than in the other genera 

 of the order, ridged and possessing several concavities on 

 the upper surface ; zygomas slender and but little curved ; 

 temporal fossae comparatively short and have well-defined 



