IV.] 



WESTERN AND EASTERN FAUNAS. 



177 



UNGULATA (continued). 

 Leptomeryx. 

 Hypertragulus. 



Colodon. 

 Systemodon. 



Protohippus. 



Hyracodon. 

 Amynodon. 



Palaeosyops. 



Prodremotherium. 



Protapirus. 



Helaletes. Lophiodon. 



Hyracotherium. 



Pachynolophus. 



Hyrachyus. 



Palaeotherium. 

 Anchitherium. Anchilophus. 



Hipparion. 



t Equus (also Neogaeic). 

 t Rhinoceros. 



Cadurcotherium. 



Elasmotherium. 

 Titan otherium. 



Brachydiastematotherium. 

 Chalicotherium. Macrotherium. 

 t Elephas. 

 Mastodon (also Neogaeic). 



Dinotherium. 

 Coryphodon. 



( Typically N. American, 

 Phenacodus IV* J , 



i but stated also to 

 Protogoma i . ^ 



I occur in Europe. 



In the foregoing table, only some of the better known types 

 have been selected, but these suffice to show that throughout the 

 Tertiary epoch a certain number of genera were common to 

 western and eastern Arctogaea. It is true that, with the exception 

 of those still existing, we have no evidence that any of these ever 

 reached the Ethiopian region ; and it is quite probable that many 

 or the whole of them never did so. By its present fauna that 

 region is, however, so closely connected with the Pliocene and 

 modern mammals of Asia and Europe, that there can be no ques- 

 tion of its right to inclusion in the same realm ; and this being so, 

 L. 12 



