THE TEETH OF VERTEBRATES 



45 



Pike, Cod, etc.). The hinge is composed of strong 

 fibrous ligament. Such teeth yield to pressure as 



Fig. 8. — Jaws of Shark 

 by fibrous membrane. 



(species unknown), showing teeth attached 



the prey passes over them, and then spring up to 

 hold it while struggling. There are two types of 



