104 COMPAEATIVE DENTAL ANATOMY 



large recurved teeth of simple form attached by 

 rounded bases to the bones of the mouth. 



The Crocodilia are related to the lizards, but 

 much more advanced in structure in many re- 

 spects. This order comprises the Crocodiles 



Fig. 33. — Teeth of Crocodilus niloticus. 



(Fig. 33), Alligators (Fig. 34), Caimans, Gavials, 

 etc. They are all covered with a dense exo- 

 skeleton of hard, calcified scutes forming a strong 



Fig. 34. — Teeth of Alligator mississippiensis. 



coat of mail, and which are variously sculptured. 

 The teeth are numerous, being confined to the 

 margins of the maxillary, premaxillary, and the 

 dentary bones and mandible. The upper and 

 lower alternate and interlock when the mouth is 



