148 BRITISH ANIMALS. 



Class III. REPTILES 



I. Heart with two auricles. 



A. Body furnished with feet. 



i. Body protected by a corneous shield. Chelonia. 

 Chelona. 

 Coriudo. 



II. Body covered with scales. Sauiiia. 

 Lacerta. 



B. Body destitute of feet. Ophidia. 



i. Ventral and dorsal scales similar. 

 Anguis. 



II. Ventral and dorsal scales dissimilar. 

 Natrix. 

 Vipera. 



II. Heart with one auricle. Batrachia, 



A. Furnished with a tail. 

 Triton. 



Destitute of a tail. 

 Rana. 

 Bufo, 



