TERTIARY MAMMAL HORIZONS. 59 



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

 mals which we are wont to consider t}-picalh- American came 

 from the Eurasiatic region, while so man\- others which we 

 always associate with Asia and Africa came from this countr}\ 

 Herein lies the necessit}- of a pal^eontological basis for zoo-geog- 

 raph)'. 



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