Thee lis (F-O RW or J NeSubeC +8-s, 
creeps therefrom, larger than there fhewn: for 
when this part turns out, it carries its little 
fhell like a pyramid obliquely on its body. Ie, 
has four horns, whereof the two upper ones 
have their eyes in their extremities. The two 
lower do not appear fo diftinctly, being only 
two obtufe or blunt little fwellings. The two 
upper horns and the eyes are large, in propor- 
tion to the bignefs of the creature. The aper- 
ture of its verge, through which it breathes, is 
likewife in its left fide. Its thell is twifted into 
feven fpiral lines, and is adorned on every fide 
with little ribs or ridges, fo that, by this means, 
very beautiful wrinkles or folds appear in this 
fhell, which has likewile its periofteum to 
cover it. 
The internal. parts of this little creature 
agrees in general with thofe of the common 
covered Snail. The parts of the jaws, mouth, 
and palate, and all the falival veffels and the 
ftomach, are alike in both. The brain lies on 
the gullet, and may likewife be beautifully di- 
ftinguifhed, but in its ftracture it approaches 
more to the brain of the common water Snail, 
which I have reprefented in Tab. VIII. fig. rv. 
Its pointed liver fills the extremity of the thell, 
and, like the latter, it is likewife twifted, but 
its {tru€ture is glandulous. The orifices for the 
penis and uterus are opened in the left fide, fo 
that the penis, erecting itfelf, {prings from a 
place directly oppofite to that in the common 
Snail. But it appears from this perfection of 
the genital parts, that the creature, though 
fo minute, has already attained’ its full fize. 
The ovary likewife appeared to me pretty di- 
ftinct. The purple facculus or bag, was like- 
wife very vifible, as well as the little part in 
the form of a chain. 
I preferved this Snail alive fome days, by 
giving it lettuce in a glafs veflel, into which I 
had poured alfo fome drops of water, during 
which time it moved the whole day. At other 
times, when the weather is hotter, this {pecies 
eat chiefly at night. In the month of June 
I found it under the bark of willows. 
If its fhell be viewed with a microfcope, the 
aperture, Tab. VIII. fig. 11. @, of the inverted 
twift, through which the body pafles, and the 
opening 4 of the pillar, and the ridges of the 
furface, or the ribs ccc, appear clearly to the 
eye. 
The finall flatted Snail, 
Under the bark of willows is likewife found 
another fpecies of {mall Snails, the fhell, fig. 
111. @, of which is fomewhat of a more fim- 
ple ftructure, and fo thin that it is all over 
tranfparent. ‘The Snail contained in this died 
for drought before I could diffe@ it. Its thell 
was all tranf{parent, by reafon of its exquifite fine- 
nefs; fo that the dead body of the Snail ap- 
69 
peared through it, diverfified with fonte colours 
and {pots. 
The oval Snail. | 
In the rufhy grafS of ditches, and on the 
water-lilly, when its leaves reach to the fur- 
face in rivers, there is found a certain fpecies 
of Snails, which refide there on account of the 
cool air and moifture, where they may at 
any time feek out for their food: but they go 
to feed chiefly late in the evening and early in 
the morning, and in the heat of the day they 
remain quiet near each other under the fhade. 
Their fhell which they carry on their bodies, 
is of an oval figure, marked with many hollows 
ot furrows, and adorned, Tab. VIII. fig. Iv. a, 
with a periofteum of a pale red colour. The 
hinder part is fo tender, that when roughly 
handled, it is very eafily broke, and this is rolled 
into a double {piral part... The body of the 
creature that creeps ¢ out from thence is mark- 
ed with points or black fpots, and in the fore 
part it {tretches out two blunt or obtufe d horns, 
under which are feen two others {maller. 
In the mouth of this Snail is a pretty {trong 
tooth, which is extended into a horny little 
bone, and expands itfelf through the whole 
inward part of the mouth. The aperture of 
the verge is on the right fide, and the orifices 
of the genital parts open,at the fame fide in the 
neck. The ftomach is of a pale colour, and is 
variegated with black points or {pots ; hence it 
appears upon the whole gray. The falival vef- 
fels which run near the gullet under the brain 
are very remarkable and large, in proportion 
to the fize of the animal, and are {peckled or 
{potted like the fomach. ‘The liver is the fame 
as in the common Snail. The heart is placed 
in the left fide, and there lies the lime bag alfo, 
which is very large, and full of round white 
globules of various fizes, The brain and nerves 
are like thofe of the common covered Snail. 
The penis appears fhort, but if the membrane, 
by which it is erected, be opened, it is found 
bent on the infide like the tendril of a vine, 
and is {een to be really very long. The ftruc- 
ture of the uterus is the fame with that of the 
common Snail; but on one fide of it is a {mall 
part that I never faw in that Snail. After this 
follows the yellow facculous bag defigned for 
the glutinous moifture ; and at length the {mall 
part in the form of a chain, which is very 
black like pitch. The purple pearl-eyed little 
Knot appears half round in this Snail, though 
it isreally fomewhat oval. I could not difcover 
more parts in this little creature, though I ob- 
ferved that it had the fame mufcles as the 
common Snail; nay, that two of them were 
defigned to pafs underneath through the brain, 
for the purpofe of drawing in the parts before 
mentioned, 
sak CHAP. 
