FRESH- WA TER JELL Y- FISHES. 1 9 



;. In specimens of Aurelia, 95.84 per cent of the animal is 

 water ; the solid matter in any jelly-fish is rarely over five per cent of 

 the whole. 



Fresh-Water Jelly-Fishes. These have recently 

 been discovered in England. They are one third of an 



FIG. 18. A jelly-fish swimming (Pelagia). 



inch in diameter, and probably come from some warm 

 climate, as they are active only when the temperature of 

 the water is about 85. 



