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GENERAL CLASSIFICATION OF POISONOUS SNAKES 
Fic. 1.—A, Cranial skeleton of one of the non-poisonous Colubridæ (Ptyas MUCOSUS) ; 
B, cranial skeleton of one of the poisonous Colubride (Naja tripudians) ; ©, cranial 
skeleton of one of the poisonous Colubride (Bungarus fasciatus) ; D, cranial skeleton of 
one of the Viperide (Vipera russellii); ©, cranial skeleton of one of the Viperide 
Crotaline (Crotalus aurissus); F, cranial skeleton of one of the Colubride Hydro- 
phiine (Hydrophis pelamis). 
