2 5 6 



TROPICAL MEDICINE AND HYGIENE 



FIG. 104. a, head of Naja bungarus^ showing occipital shields; b, 

 maxilla of Dendraspis ; c, Bungarus candidus, showing enlarged vertebral 

 scales ; d, laterally compressed tail of sea-snake ; e, head of Causus rhont- 

 beatus, showing large shields ; /, Cerastes, showing oblique lateral scales ; 

 g, head of Ancistrodon* showing large shields ; h, head of Bitis, showing 

 supra-nasal shield and small scales between nasal and rostral shields. 



