THE TEETH OF VERTEBRATES 



43 



snakes), being supported by various bones and 

 cartilages about the oral cavity. The palates and 

 vomer (Fig. 6) often carry teeth in the fishes and 



Fig. 

 palates. 



. — Teeth of Pickerel (Esox lucius), showing teeth on vomer and 



some calcified structures are on the gill arches. 

 In the sawfish there is a special development of 

 the premaxillary bones which carry teeth for de- 

 fense only (Fig. 7). 



