292 ZOOLOGICAL GEOGRAPHY. [PART III. 
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. 
