333 



expressive of more than one genus, in the light that Cariacus, Capreolus, 

 Blastocerus, Axis, Elaphus, &c., are distinct from Cervus. Future compari- 

 sons and discoveries will perhaps reduce the nine species of the five genera 

 which have been indicated to the number of two or three species of one or 

 two genera. 



Professor Marsh has referred the remarkable animals above indicated to a 

 new order with the name Dinocerata. In the uncertainty as to the true 

 ordinal position of Uintatherium, I have allowed it to remain, according to 

 my first impression, with the Proboscidea. 



UlNTATHEEIUM ROBUSTUM. 



Leidy : Pr. Ac. Nat. So. 1872, 169, in a letter addressed to tbe Academy and 

 published in advance of the proceedings, August 1, 1872. Eeprint of the 

 letter in Am. Jour. Sc. September, 1872, 239. Pr. Ac. Nat. Sc. 1S72, 211. 

 Cope: Pr. Ac. Nat. Sc. 1873, 102; Pr. Am. Phil. Soc. 1873. Marsh: Am. 

 Jour. Sc. 1873, V, 296 ; American Naturalist, January, 1873. 



Uintamastix atrox. Leidy : Pr. Ac. Nat. Sc. 1872, 169 ; Am. Jour. Sc. 1872, 239. 



Dinoceras mirabilis. Marsh : Am. Jour. Sc. 1872, IV, 344, published iu advance 

 September 27, 1872 ; ibid. 1873, V, 117-122, Plates I, II, published in advance 

 January 28, 1873; Ibid. April, 1873, published in advauce March IS, 1S73. 

 American Naturalist, March, 1873, 146. Nature, March 13, 1S73, 366. 



Uintatherium mirabile. Cope: Pr. Ac. Nat. Sc. 1873, 102; Pr. Am. Phil. Soc. 

 1873, published in advance " On the Short- Footed Ungulata of the Eocene of 

 Wyoming, March 14, 1873, 28." 



The Figs. 6 to 12, Plate XXV, Figs. 1 to 3, Plate XXVI, and Figs. 30 to 34. 

 Plate XXVII, of the present work, represent the chief type-specimens upon 

 which the genus Uintatherium was founded and the species U. robustum 

 named. Descriptions of these occur on pages 93 and 96. 



The large canine tooth represented in Figs. 1 to 5, Plate XXV, was, on 

 discovery, supposed to belong to a Drepanodon-like carnivore. The dis- 

 covery of the nearly complete skulls described by Professor Marsh under the 

 name of Dinoceras mirabilis,' and Professor Cope under the name of Loxolo- 

 lihodon cornutus, leaves no doubt that the remarkable tooth belongs to the 

 same kind of an animal, which, from the proportions of the specimen, I sup- 

 pose to be Uintatherium robustum. 



The fine skull discovered and described by Professor Cope under the name 

 of Loxolophodon cornutus, I had the opportunity' of seeing on the occasion 

 when it was exhibited at. a meeting of the Academy of Natural Sciences. 

 So far as I could judge from the cursory examination, and from the more 



