CLASS III. REPTILIA. 



ORDER I. TESTUDINATA. 



Body enclosed in a double shield ; the head, neck, 

 limbs, and tail, alone free ; the upper shield formed 

 by the union of the ribs and dorsal vertebrae, the 

 lower one by the pieces of the sternum : jaws horny, 

 without teeth : four feet. 



I. CHELONIADJE. Feet, especially the anterior 

 pair, elongated ; compressed, fin-shaped. 



1. SPHARGIS. Shell covered with a continuous 

 coriaceous skin : claws obsolete. 



2. CHELONIA. Shell covered with horny plates: 

 feet with claws. 



ORDER II. SAURIA. 



Skin covered with scales : body and tail elongated : 

 jaws furnished with teeth : generally four feet. 



I. LACERTID^. Tongue slender, extensile, 

 bifid: all the feet with five toes; these last 



