and Animalcules adhering to them . 325 
Eye, and its Body extended beyond the Shell, 
in the Action of creeping from Place to 
Place. 
The fmall Snail is turned upon its Back, 
C 2; that the true Form and Opening of 
the Shell may the better be underttood. 
I have frequently kept Numbers of thefe 
Snails, for many Months together, in a large 
Glafs Jar, with Polypes and other Water 
Animals : and ’tis very common for them to 
fatten their Spawn, in little Mattes, againft 
the : Sides of the Glafs, where the Eggs 
hatch in about three Weeks or a Month's 
Time. 
The Spawn, when firft depottted, ap¬ 
pears to the naked Eye like a tranfparent 
Jelly ; but if examined by the Microlcope, 
one fees in it Numbers of fmall and ex¬ 
ceedingly pellucid oval Bodies, at little Dif- 
tances from one another, enveloped in a ge¬ 
latinous Subftance ; having each of them 
towards one of its Extremities a very mi¬ 
nute dark Speck, wherein, if carefully exa¬ 
mined by the greatett Magnifier, a Pulfation 
may be difcerned. 
This Speck will be found to grow larger 
from Day to Day, and to become a perfect 
Snail, with its Shell compleat, feveral Days 
before it burtts through its Integuments. 
When the Eggs are about a Week old, the 
ftmbrio Snail may be difeerned in its true 
Shape, turning itfelf very frequently within 
fhe fine Fluid in which it lies: and the Heart 
Y 3 ' is 
