338 CHORDATA. 
CHAPTER XXI. 
CHORDATA—( Continued.) 
IV.—RANA. 
PHYLUM CHORDATA (p. 402). 
SuB-PHYLUM VERTEBRATA (p. 405). 
Cass AMPHIBIA (p. 439). 
Fig. 239.—THE CoMMON FROG (Rana temporaria). 
(Natural Size.) 
cago 
aoe OSE ag tie 
Note the large mouth, and tympanum behind the eye, long hind-limbs with webbed 
toes and pigmented skin. 
Rana temporaria is the common British frog of 
universally familiar appearance. A slightly larger form, 
Rana esculenta, or the Edible Frog, common upon the 
Continent, is often preferred for dissection, but the 
description here given will suffice for either species. 
The frog is a water-loving terrestrial animal. In loco- 
motion it is equally at home in water or on land. In the 
early morning and early evening, when dew and damp are 
frequent, it becomes active in the pursuit of insects, worms 
