Noguchi Plate 15 
EUS 
: n 
> SY 
hi 

Photographs of: A, Skull of Lachesis mutus; B, Skull of Ancistrodon piscivorus ; 
C, Skull of Ancistrodon contortrix; D, Skull of Crotalus adamanteus ; 
E, Rattler of Crotalus adamanteus. 
