30 



GUIDE TO EEPTILES AND AMPHIBIANS. 



of true flight, like that of a bird. The Frilled Australian Lizard, 

 Ghlamydosaurus Tcingi (379)? which can run on its hind-legs in a 

 semi-upright posture, has an expansible frill round the neck (fig. 30). 



Fig. 31. 



Australian Moloch Lizard {Moloch horridus). (No. 372-) 



In the Indian and African Uromastix (377, fig- 28) the tail is spiny, 

 and in the Australian Moloch (372, fig. 31) the whole head and body 

 are covered with spines of different sizes, the body being remarkably 

 depressed and expanded. 



The Iguanas, family Iguanidce (381-403), are the New World 

 representatives of the Agamidcc, from which they differ by the pleuro- 

 dont dentition, that is to say, by the teeth being attached to the inner 

 side of the external parapet of the jaws (fig. 29 b). Although large 

 Lizards from other parts of the world are often miscalled Iguanas, 

 the family is chiefly American, with representatives in Madagascar 

 and Fiji. There are some 300 species, arranged in about 50 genera, 



Fig. 32. 



Tuberculated Iguana (Iguana tuberculata) . (No. 381 •) 



which display considerable variation in form and habits. Some are 

 arboreal, others terrestrial or burrowing, and others semi-aquatic, 

 one of the latter resorting to the sea. Many of the species are 



