Marsh -J 256 [ApriU.1873. 



on the frontals, but mainly on the maxillaries, the nasals forming only a 

 small portion of the inner base. 11th. The orbits were not below these 

 horns, but behind them, especially when the head was in its natural 

 declined position. 12th. The zygomatic arch resembles that in the Peris- 

 sodac'tyls rather than that of the elephants. 13th. The temporal fossse 

 are large posteriorly, and not small. 14th. The occiput is oblique, and 

 not vertical, loth. The tarsus and foot are Perissodactyl in structure 

 rather than Proboscidian. 10th. The genus Dinoceras has four sacral 

 vertebrte, and the other genera probably the same. 17th. The neck in 

 Tinoceras grandis, Marsh {Eobasileus comutus, Cope), was more than a 

 foot in length, as specimens in the Yale Museum clearly show. The 

 only species of Dinocerata now known with certainty are the following : 

 Tinoceras anceps, Marsh ; T. grandis, Marsh ; Uintatherium robustum, 

 Leidy ; Dinoceras mirabilis, Marsh ; and D. lacustris, Marsh. 



