40 THE AQUA VIVARIUM. 



appears later in the season. These creatures are 

 more intelligent than fishes, and their habits are 

 proportionately more worthy of study. 



The other species is the COMMON WATER NEWT, 

 or GREAT WATER NEWT (Triton cristatus). It is 

 larger than the last. The male (Fig. 4) is even 



FIG. 4. 



more splendid during the breeding season than the 

 preceding species. They are not so numerous 

 as the last, but they are generally to be found in 

 the same places and under the same circumstances. 

 Although generally found in water, being air- 

 breathing animals, they will live out of water, 

 and may be removed and kept out of water with- 

 out injury. They take in the air necessary to their 

 life at the surface of the water, and for this pur- 

 pose they come up every few minutes ; and this 

 process may be easily perceived through the glass 

 tanks, and gives considerable variety to the living 

 movements of the various creatures. 



2. Fishes. 



Fishes are known from the Amphibia and Bep- 

 tiles by living entirely in the water, and breathing 

 by means of gills. Fish live in either salt or fresh 

 water, and very few species are capable of enduring 

 an existence in both. Fresh-water fish will be prin- 

 cipally alluded to here. It should, however, be 

 recollected, that for the Aquavivarium the smaller 



