RHI^ T OCEEOTID^. 143 



This specimen is slightly smaller than the one figured by 

 Pilhol, op. cit. pi. i., but is otherwise very similar ; the 

 length of ^73 is 0,030. Purchased, 1884. 



M. 1785. Two lower cheek-teeth; from Bach. Purchased, 1884. 



M. 1461. A third right lower true molar, provisionally referred to 

 this species ; from the Upper-Eocene phosphorites of 

 Caylux (Tarn-et-Garonne), Prance. Purchased, 1884. 



27766. Part of the right ramus of a mandible, provisionally referred 

 to this species ; from the Lower Miocene of Perrier (Puy- 

 de-D6me), Prance. This specimen shows the three true 

 molars, the anterior crescent of m. 1 being wanting. It is 

 somewhat smaller than jSTo.M. 1729, but agrees much more 

 nearly with, this than with R. minutus. 



Croizet Collection. Purchased, 1848. 



27667. An associated left astragalus and calcaneum, belonging 

 either to this species or to It. minutus ; from the Lower 

 Miocene of Chaptuzat (Puy-de-D6me). 



Croizet Collection. Purchased, 1848. 



M. 1846. An imperfect middle cervical vertebra, provisionally re- 

 ferred to this species ; from Caylux. Purchased, 1884. 



Rhinoceros occidentalis, Leidy \ 

 Syn. Aceratherium oceidentale, Cope 2 . 



This is a comparatively small species, in which the upper true 

 molars have a strong " antecrochet," but no " crochet," while 

 the premolars have a well-developed cingulum, of which there 

 is a trace in the true molars. A cranium is figured by Leidy 

 in the Journ. Ac. Nat. Sci. Philad. ser. 2, vol. vii. pi. xxii. 

 (1869). 



Hab. North America. 



29677. Part of the right maxilla, containing the last four cheek- 

 teeth, in a broken condition ; from the Miocene of Nebraska, 

 U.S.A. The teeth are somewhat smaller than those of 

 the cranium figured by Leidy, but otherwise agree. 



Purchased, 1855. 



1 Proc. Ac. Nat Sci. Philad. vol. v. p. 119 (1850; vol. dated 1852). 



2 Amer. Nat. vol. xiii. p. 771r (1879). 



