124 THREE CRUISES OF THE " BLAKE." 



themselves indicate a former land connection any more than the 

 presence of the remains of African mammals at Pikermi indi- 

 cates a direct communication between Greece and Africa. At 

 the time of their greatest development, with a geographical dis- 

 tribution extending over Spain, Germany, Asia Minor, Persia, 

 and India, the connections between the lands bordering on the 

 Mediterranean may not have been materially different from 

 what they now axe. 



