XII 



LIFE OF TERTIARY PERIOD 225 



In the later (upper) beds of the Eocene formation and 

 the Early or Middle Miocene, ancestral forms of many of our 



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[ammalia have been found both in Europe and North 



imerica ; but these are so numerous, and their affinities in 



iome cases so obscure, that only a few of the prominent 



examples need be given. One of these, whose skeleton is 



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