240 



\\\ \LS Xi:w YORK ACADEMY OF SCIENCES? 



Rhinoccrotida. — The rhinoceroses are intermediate between horses and 

 tapirs in adaptation. The Tertiary history of the group is much the 

 same, approximate series being found in Europe and North America as 

 far back as the Oligoeene or Eocene, but the phyla are less direct and 

 complete, and there is a greater diversity of type among them. The 

 Paltrarctic series appear to be more direct, and ibis, in connection with 

 the fact that the race never reached South A!nerica, may be taken to indi- 

 cate that the center of dispersal was Paltearctic rather than Xearctic, less 

 northerly than that of the horses, less easterly than that of the tapirs. 

 At all events, the relations of the later Tertiary rhinoceroses indicate that 

 North America was much more remote from the center of dispersal than 

 Europe, while southwestern Asia was very close to it. 



Table VII. — Distribution of Rhinoceroses 



"2 Includes a number of subRcnera recently defined by Abel. 



'■3 This family may be regarded as ancestral to both rhinoceroses and tapirs, but the 

 more exact derivation is doubtful. 



" Gaj fauna, uiii^r Aciuiianian auct. nigrlm. It should perhaps be regarded as Lower 

 Miocene. 



