TAILLESS BATRACHIANS. 



37 



The Ranidai, 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. 



i r© 



;fy ^ 



liana temporaria ^(Jouuuun JJiowu Frog). 



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

 Continent (K. escuknta), has 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 and commonest 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. 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 natu- 

 ralists have represented this structure to be of service to the frog 

 in taking flying leaps (the Flying Frog of Wallace). What is 



