OPHIDES. COLUBERID.E. 363 



Acanthopis. Tail terminated by a hook ; scales in front 



of the head ; sub-caudal plates simple and double. 



A. cerastinus. Daud. v, pi. 77. 



Naia. Hooded Snakes. Head moderate^ without any 

 depression^ and covered with large regular plates. 



Naia Daud. Neck capable of being dilated ; head 

 narrow ; dorsal scales linear ; tail conical ; sub-caudal 

 plates arranged in two rows. 



tricuspidans. Daud. 4. pi. 60. 



Sepidon Merr. Neck not capable of being dilated ; 

 head broad ; sub-caudal plates double. 



S. porphyraceus. Shaw, Zool. iii. 423. 



Elaps. Head narrow ; dorsal scalps equal ; tail conical ; 

 sub-caudal plates double. 



furcatus. Russ. ii. pi. 19. 



Platurus Lat, Head indistinct ; body cylindrical ; 

 dorsal scales equal ; tail compressed_, carinated ; sub- 

 caudal plates double. 



P. laticaudatus. Shaw, Zool. ii. '233. 



Trimesurus Lat. Head distinct ; body fusiform ; tail 



conical ; caudal plates partly single^ partly double. 



T. leptocephalus. Lac. Ann. Mus. iv. pi. 56. f. 1. 



Oplocephalus Cuv. Like the last, but the caudal plates 

 all simple. 



O. Cuvieri Gray. 



Family 3. COLUBERID^. 



Lower jaw mobile ; upper jaw toothed; fangs either 

 entirely wanting, or very small.* 



Coluber. Ventral plates broad ; anal spurs none ; 

 ■ tail in general much lengthened, attenuated, and 

 simple. 



* In a natural arrangement of this order, I am inclined to believe that 

 the whole of the poisonous or fanged snakes will be transferred to the last 

 family. 



