228 LYELL'S ELEMENTS OF GEOLOGY. 



Reptiles of the Lias. 



For the last twenty years, anatomists have agreed that these 

 extinct saurians must have inhabited the sea, although no living 

 marine reptile was known. They argued that, as there are now 

 Chelonians, like the tortoise, living in fresh water, and others, 

 as the turtle, frequenting the ocean, so there may have been 



