OUTLINE CLASSIFICATION 



OF THE 



MAMMALIA 



RECENT AND EXTINCT 



INCLUDING ESPECIALLY THE BETTER KNOWN GENERA 



AND FAMILIES AND THOSE MENTIONED IN 



THIS BOOK 



This classification has been prepared under the direction 

 of the author by W. K. Gregory and Johanna Kroeber 

 MosenthaL The geological range and revision of the extinct 

 genera has been done with the cooperation of W. D. Matthew. 

 The scheme of classification under four grand divisions, and 

 the order throughout, from the more ancient and primitive to 

 the more specialized forms, is that of the author. 



511 



