424 CLASS XII. ORDER It. 
Mepwsa, (sea-nettle, sea-blubber,) body gela- 
tinous, orbicular, and generally flat underneath : 
mouth central, beneath. In sea. 
Puvssopnora, body gelatinous, pendant ‘from 
an aerial vesicle, with gelatinous sessile members 
at the sides, and numerous tentacula beneath. 
In sea. 
