MASTICATION. 



27 



(Fig. 14) the teeth seem to be replaced by large flexible 

 plates of whalebone (fanons, Fig. 13) ; and in other animals, 



Fig. 14. Osseous Head of the Whale, 

 with the Whalebone present. 



even mammals, are wholly wanting, as in the 

 ant-eater (Fig. 22). 



52. In animals which do not masticate, 

 but merely seize their prey with the teeth, as 

 in crocodiles and many other reptiles, all the teeth 

 resemble each other: they have the form of 

 hooks or cones : but in animals which masticate, 

 the teeth have different forms and uses. 



Fig. 13. 

 fhe 



Whale- 

 bone. 



(Fanon.) 



^^CT^S?. 



Fig. 15. Head of the Gavial Crocodile. 



Thus, in man and most mammals there exist three kinds 

 of teeth : 1. The teeth called incisive, which have a sharp 

 cutting edge. 2. Conical teeth, which in many animals pro- 



Large Molar. 



Small Molar. Canine. Incisive. 



Fig. 16. Human Teeth. 



