Peo 16. <a) 
CLASS XIII. POLYPI. 
Riemarks. Animals of this class are called po- 
lypi, because the tentacula which surround their 
mouths, resemble, in.some degree, those of. the se- 
pia, which the ancients called polypus. ‘Fhey are 
always cylindric, terete or conic ; but the number 
and form of their tentacula are very variable.— 
‘There is a cavity in all to.receive food.;. but it is 
often a mere simple cavity or caliber.. All ani- 
mals of this class. are capable of becoming com- 
pound ; and by cutting them in a direction to se- 
parate an individual, the cutting will.live, like an 
inocculated bud. But their species are reproduced. 
by eggs. 
ORDER 1. NUDATA. 
Having no hard covering;.and not producing a 
woody, horny or fieshy aais: by combination. 
Hypra, (sprouting polypus,) animal fixing it- 
self hy the base, finear,. gelatinous, naked, con- 
tractile and furnished with setaceous tentacula. or 
feelers ; inhabiting fresh waters, and produciag 
its deciduous offspring, buds or eggs, from the 
sides. 
Pepicetuanrta, (stiff-stem,) body soft and seat- 
ed on a rigid fixed peduncle; aperture single. In 
sea. 
ORDER 2:. POLYPETRA. 
ffaving stony cases, made chiefly of carbonate of 
lime. This order embraces all the animals inhab- 
iting coral rocks, i 
*41L 
