THE 



EVOLUTION 



OF THE 



VERTEBRATES 



AND 



THEIR KIN 



BY 



WILLIAM PATTEN, PH. D. 



PROFESSOR OF ZOOLOGY, AND HEAD OF THE DEPARTMENT OF BIOLOGY 

 IN DARTMOUTH COLLEGE, HANOVER, N. H. 



WITH 309 ILLUSTRATIONS 



PHILADELPHIA 

 P. BLAKISTON'S SON &, CO. 



1012 WALNUT STREET 

 1912 



