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. 



Da Costa Professor of Zoology in Columbia University 

 Curator of Vertebrate Palaeontology in the American Museum of Natural History 



EDITED BY 



W. K. GREGORY, M.A. 



Lecturer in Zoology in Columbia University 



Cloth 8vo ix + 2jo pages Illustrated $2.00 net 



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

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

 A'al/i/'t'. 



••The whole book gives evidence of the most painstaking work. 

 Perhaps its most delightful feature is the judicial fairness and frankoess 

 with which the whole evidence is reviewed and discussed." — Science. 



THE HACniLLAN COHPANY 



Publishers, 64-66 Fifth Avenue, New York 



