REPTILES. 
299 
at the tip, like that of the American Monkeys; its under 
surface is roughened with small granulated papilla, as is 
that of the toes also, probably in order to the more deli- 
cate perception of the surface grasped. The tougue 
affords an analogy to tho same organ in the Woodpeckers, 
no less singular than that of the feet; for, though ordina- 
rily concealed within the mouth, it is capable of being 
darted forward at its insect prey, and, being furnished 
with a glutinous secretion, secures it by its adhesiveness. 
A most extraordinary aspect is communicated to these 
Chameleon. 
Reptiles by the structure and movements of their eyes. 
