The Conquest of the Land 



included a large number of marine forms, comparable to the 

 porpoises and whales among the mammals, and flying forms 

 whose aspect must have resembled, and been equally terrifying 



Photo : Berridge. FlG. 92. Reptiles A Chameleon. 



with, that of our mythical dragons. A few reconstructions of 

 these are shown in Fig. 91. 



All living reptiles, with a single exception, belong to the four 

 comparatively modern types of the lizards, snakes, tortoises, and 



Berridge. FlG. 93. Reptiles Indian Python. 



crocodiles, of which examples are illustrated in Figs. 92 to 95. None 

 of these are closely related to the mammals or birds. For the 

 common ancestor of all these types we must go back to some 

 primitive reptile form. Fortunately such a type is represented 



"5 



