LIST OF ILLUSTEATIONS. 



Fig. 1. — A. Skull of one of the non-poisonous ColuhridcB (Ptyas mucosus) 7 



B. Skull of one of the poisonous Colubridte (Naja tripudians) 7 



c. Skull of one of the poisonous Colubridte (Bungarus fasciatus) 7 



D. Skull of one of the Viperidis (Vipera russellii) ... ... ... 7 



E. SkuU of one of the ViperidcB Crotalinie {Crotalus durissus) ... 7 



F. SkvM oi one oithe ColubridcE Hydrophiirue (Hydrophispelamis) 7 

 Kg. 2. — A. Maxillary bone and fangs of one of the Viperidce (Vipera 



ruasellii) 8 



B. Maxillary bone and fangs of one of the Colubridcs {Naja tripu- 



c. Maxillary bone and fangs of one of the Colubridte (Bungarus 



fasciatus) ... ... ... ... ... ... ... ... 8 



D. Maxillary bone and teeth of one of the non- poisonous Colu- 

 bridte (Ptyas mucosus) ... ... ... ... ... ... 8 



Fig. 3. — A. Fang oi one oi the Viperidce (Vipera russellii) ... ... ... 8 



D. Transverse section of the fang 8 



Fig. 4. — B. Fazig oi one oi the Colubridte [Naja tripudians) ... ... 9 



B. Transverse section 9 



Fig. 5. — G. Faxig oi one oi the Hydrophiints (Hydrophis pelamis) 9 



p. Transverse section 9 



Fig. 6. — Three transverse sections of a poison-fang of one of the Colubridte 9 

 Fig. 7. — Marks produced on the skin by the bites of different species of 



snakes 10 



Fig. 8. — Poison-gland and fangs of a venomous snake (Naja tripudians)... 11 



Fig. 9. — Muscular apparatus and poisjaiTgland of Vipera russellii ... 12 



Fig. 10. — Muscular apparatus and poison-gland of Vipera russellii ... 12 



Fig. 11. — Muscular apparatus and poison-gland of Naja tripudians ... 13 



Fig. 12. — Muscular apparatus and poison-gland of Naja tripudiams ... 13 

 Fig. 13. — Arrangement of the scales of the head in one of the non-poisonous 

 Colubridce (Ptyas mucosus) 



Fig. 14. — Arrangement of the scales of the head in one of 



Colubridte (Naja tripudians) 



Fig. 15. — Feeding a poisonous snake (first stage) 



Fig. 16. — Feeding a poisonous snake (second stage) ... 



the poisonous 



14 



15 

 18 

 18 



