280 Fresh Water Aquarium 



be distinguished. While the frogs interest 

 us chiefly as inmates of the aqua-terrarium, 

 the larva only is desirable for the aquarium, 

 where, feeding on refuse, vegetable as well 

 as animal, it does good service as a scaven- 

 ger. We recommend the following species 

 for the aquarium: 



The Bull Frog (Rana catcsbiana), one of 

 the biggest and best known of the batra- 

 chians, gets its name from its voice, which is 

 radically different from that of all other 

 frogs, being deep and powerful and fre- 

 quently heard even in the daytime. In the 

 Northern States this frog grows to the re- 

 spectable length of six inches, while in the 

 South, much larger specimens can be found, 

 some attaining a length of from 8 to 9 inches. 

 In shape the bull frog is stout, with limbs 

 rather short, but strong and well adapted 

 for rapid swimming. The head is broad 

 and the mouth so wide that it enables this 

 voracious robber to swallow prey of nearly 

 its own size. Characteristic is the large 



