]6o 



CLASSIFICATION OF REPTILES. 



limbs^ or with those members in an almost rudimentary 

 State ; the belly protected by large transverse plates. 



Family 1. HYDROPHID^, Sw. Water Snakes. 



Body and tail (fig. 112 a.) much compressed; nostrils 

 vertical, operculated ; ventral plates narrow, formed of 

 two united scales ; anal spurs none. 



Hydrus Shaw (fig. 112.) Head small, and not enlarged 

 behind; the snout obtuse, 

 and the upper part covered 

 with large plates ; body co- 

 vered with scales; belly with 

 two rows of larger scales. 



nigriciiictus. Russ. Serp. pi. 6. chloris. lb. pi. 7. 



Pel AMIS Daud. Head gibbous, or enlarged behind ; 

 all the scales small, equal, and hexagonal ; head with 

 large plates ; poisonous. 



P. bicolor Schn. Russ. Serp. pi. 41. 



Chersydrus Cuv. Head and body entirely covered 

 with small carinated scales ; the tail compressed. 

 C. granulatus Mer. 



Achrocordus Cuv. Resembling the last, but the tail is 

 not compressed. 



A. Javanicus Auct. dubius {fig. 113.) 



