THE H-ISTORY OF LIFE 



155 



Photograph from Am. Mus. Natural History 



FIG. 30. Skeleton of Patriofelis ferox, Marsh. A large carnivorous creodont mam- 

 mal from the lower Tertiary (Bridger Eocene) of western North America. 



Photograph from Am. Mus. Natural History 



FIG. 31. Patriofelis ferox, as restored by C. R. Knight. The creodonts, in later 

 periods, gave place to the modern carnivores, the very numerous creodont genera 

 becoming extinct. 



II. In some respects the Miocene divisions of the The 

 Tertiary, say about a million years ago, saw the culmi- 

 nation of life in the northern hemisphere. The climate 



