Of the frefi Water Polype. 203 
ibottom ana Tides thereof, and the knot end towards the 
bottom ; that if the polype fbould hide by its own weight, 
it mmht not be able to difengage itfelf. This method is 
ufed to prevent the polype from turning itfelf back into 
its natural ftate, v/hich they fometimes do in twenty-four 
hours after they have TufFered this operation ; and often 
after they have been turned, and fpitted, to prevent them 
from returning, they have tore their lips, and by that 
means have formed two heads. 
Several young ones have been produced from thefe 
turned polypes, which have alfo multiplied. 
Sometimes they will eat in two days after they have 
been turned, but generally not till four or five days 
after. 
Moft of thofe Mr. Trembley turned, endeavoured to 
return themfelves again, but could not entirely effedl 
it, remaining like a polype partly turned, as at fig. 406. 
the fkin of its anterior part being applied upon the other, 
and forming a kind of pad at the anterior end a c, one 
part thereof being turned, and the other not. Its lips a, 
are no more at the anterior end, but are round that part 
of the body which is not turned back again, from whence 
alfo the arms proceed, varying their diredhon, fometimes 
pointing towards the tail, fig. 406. and at others are bent 
over the head,fig.407. their anterior extremity c, fig. 406. 
formed by the edges of the reverfed part c a, remained 
open, and fome days after began to clofe 5 and on being 
attentively obferved, new arms began to (hoot near the 
old ones, and feveral mouths r were alfo formed near 
the middle of the bodies of thefe polypes, that is to 
fay, near the place where their arms joined the body at 
a, fig. 406. 
A polype 
1 Hkk de Polype, p. 2,68. 
