Figure 1. 



The crown or top of the head of a typical snake to show 

 head shields. 



Nos. — nostril. 

 E - eye. 

 K = rostral, 

 I = internaBal. 



Pf. = prse-frontal. 

 F ■= frontal. 

 9 = supra-ocular. 

 P = parietal. 



T = tenjporal. 



