HISTORICAL ZOOGEOGRAPHY 119 



which has received the bulk of its fauna over Pliocene and Pleisto- 

 cene land bridges, and is therefore poor in endemic genera. Ceylon, 

 on the contrary, is a land of vast age, neighboring an ancient con- 

 tinental area, and displays a geological history in its fauna and 

 flora beside which that of Celebes seems like a single day. . . . In 

 Ceylon the geologically older forms of animals, the planarians, 

 mollusks, and reptiles, have followed different laws of dispersal 

 from those which apply to the geologically younger mammals. 

 Celebes by contrast, received its fauna at a time when the mammals 

 too had reached a high stage of development, so that in this island 

 there is no difference in the history of the different groups of 

 animals. 02 



Historical zoogeography is at the beginning of its labors. Much 

 detailed investigation remains to be made, and the insufficient scope of 

 the preliminary work now available makes it difficult to attain a 

 general view or a single interpretation; cf. Newbigin, 1936. 03 



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