THE DECIDUOUS DENTITION 



251 



tion to be expected from the more molariform condition of the 

 first milk molar. 



Passing to the New- World Monkeys we find a somewhat dif- 

 ferent state of affairs. These animals possess three permanent 

 premolars and three milk molars bnt the first successional tooth 

 to erupt, as in the various Old-World families, is the first molar. 

 In the Sapajou Monkey (Cebus) which we may take as an ex- 



Fig. 92. — Deciduous dentition of Bengal Macaque (Pithecus rhesus, Audebert ; 

 9.823-11). In this animal the milk teeth have approached more closely in feature to 

 the permanent teeth than in Man or Anthropoids. 



ample the milk incisors and canines, though small, do not shoAV 

 such striking divergences from the patterns of the correspond- 

 ing permanent teeth as do the postcanines. There being one 

 more postcanine than in the Old- World families the essential 

 functions of shearing and crushing can be more distributed. 

 Consequently while the last milk tooth is purely molariform 

 the first is equally definitely sectorial and of simple premolari- 

 forni pattern, the tooth which is intermediate in position being 



