I So Of the frejh Water Polype. 
for a horn, or flefhy dart, proceeding from the fore part 
of their head at d. Mr. Reaumeur had called them 
darted millepedes. They fupport themfelves, and fwim 
in the water by means of the feveral fwift inflections they 
make with their bodies; they reft themfelves, and creep 
upon all the bodies they meet with, and are often found 
in great numbers upon aquatic plants $ thofe upon which 
the firit polypes of the fecond fort were found, were well 
flocked with thefe millepedes, and were taken out of the 
water together with them, and put into the fame glafs 
without any defign. 
A few days after the anterior end a, of a polype, fig. 
366. was obferved, with one of thefe millepedes partly 
within its mouth, and the other part yet without it at 
m, not knowing at firft whether the polype was eating 
the millepedes, or whether the millepedes had introduced 
itfelf voluntarily into the polype’s flomach,to be nourifhed 
there, to lodge its eggs, or depofite its young therein, 
but at laft it was entirely entered into the polype’s body. 
The long armed polypes being the moft remarkable in 
their feeding, &c. for that reafon principally, Mr. 
Trembley thought proper to defcribe thefe experiments, 
upon that fort, from which one may eafily judge the fame 
of the other two forts. 
To fee thefe polypes feize their prey with their arms 
extended, they muft be put into a glafs, feven or eight 
inches deep, if the polypes are fixed to the top of the 
glafs, their arms for the moft part hang down towards 
the bottom. This is then the moft convenient fttuation 
to give them food, and to obferve how they manage it. 
To this end one might caufe them to hang from the 
iurface of the water, but this expedient is not always 
beft. 
The 
% 
