LECTURE VI. 



149 



The formation of the rows of teeth^ and of the teeth them- 

 selves, is closely connected with the projection of the muzzle 

 (prognatliism) , which in the ape reaches a far higher degree 

 than in the lowest human races ; the palate becomes long and 

 narrow ; the rows of teeth, on the whole, parabolic instead of 

 elliptic ; the teeth themselves are distinguished by their size, 

 hardness, and whiteness. The formation of their crowns, of 

 the cusps of the molars, and of the chisel-hke edge of the 

 incisors, is so extremely similar, that it is possible to be in 

 doubt about a single tooth, as to whether it is human or 

 simian ; but the doubt is no longer possible when the whole 

 row of teeth can be inspected. It is specially the canine teeth 

 which in apes destroy the harmony of the dental structure. 



Fig-. 50. Base of tlie Skull of Cebus alUfrons. — The Maxillai-y Suture is 



obliterated. 



