lOO BtiUetin American Museum of Natural History. [Vol. XVI, 



the somewhat abbreviated nasals, greater expansion of the 

 buccal processes, and two distinct internal cones upon the 

 superior premolars. It is represented also by a number of 



''^^^^iteiiliiti'iiifiiiittiiii iifi 



Fig. 5. Megacerops bicornutus. (Arner. Mus. Nat. Hist. No. 1476.) Type. X J. 



large skulls in the National Museum definitely recorded by 

 Hatcher from the Upper Beds. 



Megacerops marshi, sp. no v. 



Type, Skull No. 501, cotype, skull No. 1445, Amer. Mus. Nasals 

 elongate and square distally, horns short, of oblique oval basal sec- 

 tion, overhanging the maxillse, or projecting forwards or outwards. 

 Incisors, if. Canines short, tetartocones of premolars moderately 

 developed. 



These skulls were previously confused by the writer with 

 T. irigonoceras , from which they are readily separated by the 

 horn section, which relates them to some of the primitive 

 types of M. brachycephalus and equally to M. robustus. The 

 canines are more obtuse than in M. dispar, and the superior 



