TERTIARY MAMMAL HORIZONS. 59 



of Tylopoda, the peccaries. It is paradoxial that so many ani- 

 mals which we are wont to consider t}'pically American came 

 from the Eurasiatic region, while so many others which we 

 always associate with Asia and Africa came from this countiy. 

 Herein lies the necessity of a palseontological basis for zoo-geog- 

 raphy. 



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