Evolution of 

 Mammalian Molar Teeth 



To and from the Triangular Type 



Including collected and revised researches on trituberculy and 



new sections on the forms and homologies of the 



molar teeth in the different orders 



of mammals 



By HENRY FAIRFIELD OSBORN, Sc.D., LL.D., D.Sc. 



Curator of Vertebrate Palaeontology in the American 

 Museum of Natural History 



EDITED BY 



W. K. GREGORY, M.A. 



Lecturer in Zoology in Columbia University 



Illustrated, cloth, 8vo, ix-\- 250 pages, $2.00 net 



"The author has succeeded in placing trituberculism on a much more 

 secure and unassailable basis than it ever previously occupied." Nature. 



"The whole book gives evidence of the most painstaking work. Perhaps 

 its most delightful feature is the judicial fairness and frankness with which 

 the whole evidence is reviewed and discussed." Science. 



THE MACMILLAN COMPANY 



Publishers 64-66 Fifth Avenue New York 



