ARRANGEMENT OF TEETH AND FANGS, 
The arrangement of the teeth and the presence or absence of fangs 
are of cardinal importance. Every poisonous Snake is provided with 
fangs, while, with one exception—and there may be others—that of 
Psammodynastes pulverulentus, innocent Snakes are free from such 
weapons. The manner in which the efficient and supplementary fangs 
are attached to the jawbone is well shown in A, B, C, whilst D demon- 
strates the mode in which the recurved teeth of an innocent Snake 
are fixed. The relations of the poison fangs and ordinary teeth are 
still further illustrated in the skeleton heads of the Russell’s Viper 
(Daboia Russellii), Bungarus fasciatus, figured in Plate 20, and of the 
Cobra (Naja tripudians), in Plate 21, contrasted with the dentition 
displaying the simple fish-like teeth of the non-poisonous Dhamin 
(Ptyas mucosus) in Plate 21. The fangs are separately figured in A, B, C. 
These are either channelled into a tubular canal, as in the Daboia and 
Cobra, or only grooved as in the Hydrophis. It is through this tubular 
or grooved fang that the poison is injected from the poison-gland into 
the tissues of an effectively bitten animal or man. 
