292 ZOOLOGICAL GEOGRAPHY. [part in. 



being so scanty, it would be imprudent to attempt any more 

 detailed explanation of the peculiarities of its existing fauna. 

 The sketch now given is, it is believed, founded on a sufficient 

 basis of facts to render it not -only a possible but a probable 

 account of what took place ; and it is something gained to be 

 able to show, that a large portion of the peculiarities and 

 anomalies of so remarkable a fauna as that of the Ethiopian 

 region, can be accounted for by a series of changes of physical 

 geography during the tertiary epoch, which can hardly be con- 

 sidered extreme, or in any way unlikely to have occurred. 



