DINOCERATA. 587 



base of the posterior horn-cores, the quadrate instead of triangular section 

 of the median cores, their greater stoutness, their lack of internal angle, 

 and the extent of their inner face covered by the nasal bones. It more 

 nearly resembles the E. f meatus Cope, and may possibly prove to repre- 

 sent an old male of that animal. There is, however, a considerable dis- 

 parity in their sizes; and the horns of L. galeatus differ in the greater stout- 

 ness, having twice the diameter, Avith little greater height. They differ 

 also in form, in the abrupt contraction just below the apex. The cornice- 

 like cores of the nasal bones represent the tubercles of the E. pressicornis. 

 The posterior horns differ in many ways from those of the E. furcatus, and 

 are probably sufficient to indicate a different species. 



From the bad lands of South Bitter Creek, or the Mammoth Buttes, 

 of Southwestern Wyoming; the Washakie Basin. 



UINTATHERIUM Leidy. 



Proceed. Acad. Nat. Sci. Phila., 1872, p. 169 (published August 1). Uintamastix Leidy, loc. cit. : f Dino- 

 ceraa Marsh, Amer. Journ. Sci. Arts, 1672, October, 1872 (published September 27). 



This genus resembles Eohasileus in its general proportions, but differs 

 in its more elongate cervical verterbrse. The centra of these are flat at both 

 extremities, but have not such a marked elephantine abbreviation as seen 

 in the genus named. This enabled the head to approach the ground more 

 nearl}^, and as the limbs were shorter in some of the species, they no 

 doubt modified the length of the muzzle and lips. 



Several names have been applied to this genus. Professor Leidy's 

 name, here employed, bears date early in August. Under date of Septem- 

 ber 27, Professor Marsh proposed the name Dinoceras (Amer. Journ. Sci. 

 Arts, 1872) for the U. mirabile, but did not give his reasons for separating 

 it from his inoceras (the names of the two bear an objectionable resem- 

 blance), or those published by Dr. Leidy or myself As it is propably 

 synonymous with Uintatherium, I include it here, as is done b}^ Dr. Leidy. 



I am acquainted, by autopsy, with two species of this genus. None 

 of them are so large as the Eohasileus pressicornis. U. rohustum Leidy, is 

 Bmaller, and the U. lacustre Marsh, smaller still. U. mirdbile {Dinoceras) 



