330 



MANUAL OF ZOOLOGY 



SECT. 



anterior extremity of the head, on the ventral side. In 

 front of it are the nasal openings (nostrils), which are also 

 ventrally situated. 



In the Lizard (Fig. 193), the surface is covered with a 

 system of overlapping horny scales. The head is separated 



FIG. 193. Lizard. (After Brehm.) 



from the trunk by a distinct constricted region, the neck. 

 The tail is extremely long and narrow. The two pairs 

 of limbs are adapted to running on the surface of the 

 ground. Each consists of three divisions arm, fore-arm 

 and hand in the anterior limb, thigh, leg and foot in the 

 posterior ; and each hand and foot contains five slender 



