FRESH-WATER JELLY-FISHES 



59 



These being our preconceptions about jelly-fish, great 

 was the excitement when, in 1 880, hundreds of beautiful 

 little jelly-fish were suddenly discovered briskly expand- 

 ing and contracting, rising and sinking in the water of a 



Tc 



FlG. 2. The common jelly-fish (Aurelia aurita) one-third the 

 natural size ; or, one of the four arms or fleshy tentacles 

 surrounding the diamond-shaped mouth ; Tc, one of the 

 eight eye-bearing tentacles at the edge of the disc ; GP, 

 opening of one of the four sub-genital pouches, which bring 

 sea-water close to the ovaries and spermaries, which, how- 

 ever, do not open into these pouches ; #and_y, outline of 

 the sub-genital pouches seen through the jelly. 



large fresh-water tank in the middle of London (Fig. 3). 

 You never know who or what may turn up in London. 

 A badger, a green parakeet, a whale, an African pigmy, 

 an Indian scorpion, and a voice worth ten thousand a 

 year, have all, to my knowledge, been stumbled upon unex- 

 pectedly at different times in the highways of London. A 

 new jelly-fish was perhaps one of the least expected 

 " casual visitors." It was found in the large tank four 

 feet deep in which the great tropical water-lily the 

 Victoria regia and other tropical water plants are grown 



