Animalcules found in Water.. 3 87 
Angles, and at their joining on the Back 
and Belly o'btufe Angles ; but the upper 
Shells projeded beyond the lower, which 
appeared beyond the upper towards the Tail, 
and probably by this Means thefe upper Shells 
ferved the 1 11 fed: inftead of Fins, and to keep 
it up in the Water. All the Shells were 
elliptical* 
The Figure reprefents the In fed fwi na¬ 
ming, when the Head appeared beyond the 
Shells without any Antennae or Feelers: the 
Tail was divided and extended : the Body 
Was very apparent* and that Part which is 
on the Back in the Middle was in a con- 
dan t Motion, alternately contracting and di¬ 
lating, From each Side below this Part there 
appeared a Ligament, terminating at the 
Circumference of the upper Shells, and may 
perhaps ferve to keep the Shells fleady, or 
to move them, if they be moveable. Which. 
I could not difeover, for the Motion of the 
Infed is very equable and fmooth. 
Fig. 8. is an Infed which I am apt to be¬ 
lieve is the fame as fig . 5. in another Pofture, 
as it Hands feeding in the Water : for it a- 
grees in Colour and in the Shell e-xadly : the 
Antennae and Arms have as near a Refem- 
blance as can be expeded in fucb differing 
Pofitions. It has indeed two Legs behind/ 
wherewith it fixes ltfelf to the Glafs, which 
do not appear in the other; but if they are 
<?nly to fix itfelf, they may be covered under 
C c 2 the 
