3BB Animalcules found in Wdtefi 
the Shell when fwimming: however thef£ 
is fome Difference in the Appearances. This- 
Infedf fwims well and nimbly, and by a ra¬ 
pid Motion of its Arms makes a ftrong Cur¬ 
rent to bring it Food: (which Manner of 
feeding by a Current or aft Eddy is common 
to many other Water Animals :) indeed, the 
Swiftnefs with which it moves not only 
the two Arms that are extended to draw 
Things to it, but alfo thofe that are bent back, 
to drive aion^ each Side what is not fit for 
its Food, and the Way they co-operate all 
together to make a flrong Stream, is incon¬ 
ceivably curious, as well as its Conflancy 
and unwearied Application. When it is dis¬ 
turbed it draws itfelf intirely into the Shell, 
and then appears not unlike a fmall Frefit 
Water Mufcie, 
The Infedt fig . 9. is very uncommon : I 
never met with any more of the Kind, nor 
with any Account of it. At firfi, when I 
found it among fome Water in a Leaden 
Ciftern flocked with the Nymphce Vermiculi 
of the Gnat, I fancied it might be the Ver- 
miculus of that Infeft; efpecially as the Head 
was not very unlike it, and it had pulmona¬ 
ry Tubes towards the Tail, as the Nympha 
Vermtculus has one. But as it never chang¬ 
ed its State during three Weeks that I kept- 
it. alive, though the Gnats changed much 
fooner, and it has many different Parts from 
thofe a 
