Chap. XII.] 



REPTILES. 



33 



gascar, is produced into two great, solid, bony projec- 

 tions, covered with scales like the rest of the head ; and 

 of this wonderful modification of structure the female ex- 

 hibits only a rudiment. Again, in Chamceleon Owenii 

 (Fig. 36), from the West Coast of Africa, the male bears 



Fig. 35. — Chamseleon bifurcus. Upper figuie, male ; lower figure, female. 



on his snout and forehead three curious horns, of which 

 the female has not a trace. These horns consist of an ex- 

 crescence of bone covered with a smooth sheath, forming 

 part of the general integuments of the body, so that they 

 are identical in structure with those of a bull, goat, or 

 other sheath-horned ruminant. Althouo;h the three horns 



