134 ECOLOGICAL FOUNDATIONS OF ZOOGEOGRAPHY 



east coast itself the maximum wealth of species is reached in the 

 broken Dalmatian coast with its islands. 49 



It has been supposed, on this account, that a richly differentiated 

 fauna in a relatively small area would warrant the supposition of its 

 former greater extent. This has been postulated for the Seychelles, 

 with their giant land turtles, their giant birds, and otherwise rich 

 animal life; Wallace applies the same reasoning to Australia. There 

 is unquestionably a certain relation between the size of a region and 

 the variety of its fauna, but it cannot be expressed in figures or 

 otherwise sharply enough defined to afford a sufficient basis for con- 

 clusions of this nature. 



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