362 



CLASSIFICATION OF REPTILES. 



Craspedocephalus Fitz. Head covered with scales : sub- 

 caudal plates double. 



C. rhombeata Max. 



CoPHiAs Merrem. Tail simple ; head large, broad 

 behind_, sub-triangular, covered only with scales ; 

 sub-caudal plates double, (^fig. 115). 



C, lanceolatus. Lac. ii. pi. 5. f. 1. 



Trigonocephalus Op- 

 pel. DiflPers from 

 the last in having 

 plates upon the 

 head. {fig. 11 6.) 

 T. orophyas 0pp. 



Cerastes Antiq. 

 Head broad, co- 

 vered with scales 

 or smaU shields ; no depressions behind the nostrils. 



Cerastes, proper. 

 Head covered 

 with scales si- 

 milar to those 

 on the back ; 

 nostrils large, 

 simple ; sub- 

 caudal plates double, 

 S. horridus. Sw. Shaw, Zool. pi. 103. (Jiff. 117.) 



Berus. Head covered with granular scales ; nostrils 

 moderate ; sub- caudal plates double. 



B. vulgaris. (Coluber berus Linn.) 



Echis IMerr. Scales of the head small; sub-caudal 

 plates single. 



E. bizonata. Daud. pi. 70. 



