TAILLESS BATRACHIANS. 



37 



The Ranida, or true Frogs, have teeth in the upper jaw ; the 

 transverse processes of the sacral vertebra are not distinctly dilated. 

 Two species occur in this country : the common Frog (Rana tern- 



Fig. 25. 



Rana temporaria (Common Brown Frog). 



poraria) is indigenous ; the second species, the Edible Frog of 

 the Continent (R. escul.enta), has probably been introduced, and 

 has thoroughly established itself in some parts of Norfolk. The 

 Bull-Frogs, so called from their bellowing powerful voice, are 

 R. catesbiana of North America, and R. tigrina, the largest Frog 

 of India ; R, adspersa, also one of the largest species, is found in 

 various parts of tropical Africa, and remarkable for its toad-like 

 appearance. The largest known Frog is Rana guppyi, from the 

 Solomon Islands, the body of which measures nearly a foot. This, 

 family also contains arboreal types, of which Rhacophorus maximus, 

 from the Himalayas and the hills of Assam, is a representative. 

 In this genus the webs between the fingers and toes are much 

 developed and very broad, so that some naturalists have represented 

 this structure to be of service to the frog in taking flying leaps 



