Of the frefh Water Polype . i yy 
and on being drawn out of the water, its tail, which was 
dry before, will remain fo; and it may be immediately put 
into the clean water, by obferving the foregoing directions. 
Polypes commonly fix their tail to {tones, or aquatic 
plants, See. fo fait as to prevent their being drove away 
by the ftream, and are fometimes fixed not only by their 
tails, but by two or three of their arms alfo, which they 
direct different ways; and being thus fixed cannot bs 
tolled about by the motion of the water. 
Two long armed polypes fufpended from the furface 
of the water in a glafs, are reprefented exa&ly in the 
pofition they were found, at a, b, and c, d, fig. 359. 
One of them d c, had two of its arms d, i, and d, k, 
fixed againft the bottom of the glafs, but on oppofite 
fides thereof, at i and k. The other a b had alfo one arm 
a g, fixed againft the bottom of the glafs, at g, and its other 
arm a h, fixed againft the fide at hj they held themfelves 
fo faft in this pofition, that the glafs was forcibly fhaken 
before they quitted their hold. 
The polype’s mouth is fituated at the anterior end of 
its body, in the middle between the {hooting forth of 
the arms. It is very often ftretched out, at which time 
it reprefents a little conical nipple, as at a, fig. 333. and 
fig- 3+3. The cone it forms appears fometimes truncated, 
as at a, fig. 362. At other times no nipple can be dif- 
coyered, the interval between the arms being clofed, as 
at a, fig. 338. and 344. in other circumftances it is 
hollow, being open, and a little widened, as at i, fig. 
331. or at e, fig. 332. and a, fig. 362. it is not only 
open in this circumftance, for if it is obferved wifti a 
magnifying glafs, when flat, or when it forms a trun¬ 
cated cone, a little hole is generally feen at the end 
thereof, which is reprefented as it appears when magni¬ 
fied at a, fig. 362. 
