340 ORDERS OF MAMMALIA. 



Sivaknsis of the Siwalik Hills, in deposits whicli are usually 

 regarded as of Upper Miocene age, though there is good 

 reason for rather regarding them as belonging to the Plio- 

 cene. In the Pliocene of Europe, Xorth America, and South 

 America, the genus is well represented ; and the Equus 

 fossilis of the Post- Pliocene and Piecent periods is specifically 

 undistinguishable from the existing Uqitits caballns. 



