Of the frejh Water Polype. 20 7 
Fisc. 424. fnews the fame two polypes, whereof a d, 
of the interior, tore the part i b of the exterior one far¬ 
ther up, even to e ; where the briftle at hr ft ran through 
both the polypes together : but when in the ftate repre- 
fented by this figure it pierced the interior one c a i d at 
e, and the exterior one a i b at i. . 
Fig. 425. reprefents the fame two polypes after the 
.anterior one a e b, had tore up the lips of the exterior 
one, ced, and came out therefrom ; they were feparated 
in a few days, and both of them did well. 
Mr. Trembley hath given us a curious drawing of an 
aquatic animal w r hich he calls a plumed polype; it is re- 
prefented as they appear in the microfcope at fig. 426. 
The plume and length of its body taken together are 
about two twelfths of an inch in length, its body very 
final], almoft cylindrical, and fkin perfectly tranfparent. 
The plume is a continuation of this tranfparent fkin, 
very large in proportion to its body, and of a very re¬ 
markable figure. 
Its bafe e a c is in the form of an horfe-fhoe, from 
the edges of which proceed the arms ad, a d, ad, whofe 
extremity is a little turned outwards, and are fo clofe 
together, that the plume contains 50 or 60. The bafe 
e a c of this plume ferves the animal for a mouth ; its 
inteftines may be diftinftly feen through this tranfparent 
fkin at e b, f g, f a, and are of a brown colour; after the 
animal hath eaten, three principal parts of their inteftines 
are vifible, the gullet e b, the ftomach f g, and the ft rail 
inteftine f a. 
Thefe animals withdraw themfelves into a cafe i, k, I, 
B, I, m, that feems to be compofed of the fame Iranfpa- 
rent matter with the fkin of the body, which is faftened 
by its inferior extremity i b, IB, to the orifice of the 
cafe j fo that whenever the .animal retires into the cafe, 
' the 
