Chap. XII. 
REPTILES. 
35 
on his snout and forehead three curious horns, of which 
the female has not a trace. These horns consist of 
an excrescence of bone covered with a smooth sheath, 
forming part of the general integuments of the body, 
so that they are identical in structure witli those of a 
Fig. 35. Chamgeleon bifurcus. Upper figure, male ; lower figure, female. 
bull, goat, or other sheath-horned ruminant. Although 
the three horns differ so much in appearance from 
the two great prolongations of the skull in (7. ’bifurcus, 
we can hardly doubt that they serve the same general 
purpose in the economy of these two animals. The 
D 2 
