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 



Mammalia have been found both in Europe and North 

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

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

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



Q 



