352 



GENERAL ZOOLOGY 



both pairs of limbs in connection with their adoption of a 

 burrowing life, and the eyes have disappeared beneath the 



FIG. 177. Photograph of Legless Lizard 



skin. The covering of scales, so characteristic of reptiles, has 

 also in some cases become much reduced. Legless lizards 



FIG. 178. Photograph of Mexican Iguana 



(Fig. 177) may be distinguished from the snakes, which they 

 resemble, by the fact that they are incapable of opening the 

 mouth to so great an extent as snakes are. 



