124 CLASS XII. ORDER II. 



MEDUSA, (sea -nettle, sea-blubber,) body gela- 

 tinous, orbicular, and generally flat underneath : 

 mouth central, beneath. In sea. 



PHYSSOPHORA, body gelatinous, pendant from 

 an aerial vesicle, with gelatinous sessile members 

 at the sides, and numerous tentacula beneath, 

 In sea, 



