222 



TROPICAL MEDICINE AND HYGIENE 



On the top of the head (fig. 92), we observe, from 

 before backwards, the rostral (r.) covering the tip of the 

 snout ; a pair of internasals (i.n.) between the nostrils ; 

 a pair of pref rentals (/>./.) ; a large frontal (/.) flanked on 

 either side by a supra-ocular or supra-orbital (s.o.) between 



FIG. 92. 



FIG. 93. 



the eyes ; a pair of large parietals (p.) ; and two rows of 

 smallish temporals (/./.). Sometimes there is a pair of 

 large occipitals immediately behind the parietals ; this is 

 the case in the formidable " king cobra " (Naia bungarus) 

 of Southern Asia. 



