TONGUES 



11 



vertically, like that of a fish, and has a fringe on the 

 upper edge, like a fin. But in those which are almost 

 purely land-haunting, as the true salamanders, the tail 

 is round. But some amphibians, also, have a fringe 

 on the tail at that time only when they come to the 

 water. In none of these fins now are there any sup- 

 porting filaments or spines, as there are in those of 

 the fishes ; and no amphibian has fins on its sides. 



Tongues 



In this class of vertebrates the tongue is an in- 

 teresting member, and here finds its first and best 



Fig. 7.— Flying trce-lrug {Mhacophorus reiuhardtii). 



development (Fig. 8). In some frogs it is entirely 

 absent, but in most of them it is large, and can be 

 thrust out very far as a capturing instrument — having 



