82 The 
manifeft figns of fight appear ; though in the 
mean time the eyes of this {nail do not, inref 
pect to the parts which are common to the 
eyes Of all Snails, differ any thing from thofe 
of others. Qn the infide, at the edge of the 
fhell, is feen the verge, which furrounds the 
whole body, and is pervious to no air: this I 
have remarked alfoin other fpecies of Snails, 
On the right fide of it are two other apertures, 
one of which ferves to evacuate the fcecés, 
through the other the genitals are extended. 
And thefe are all the outward parts of this little 
creature. Moreover, this Snail is of a very {trong 
conftitution, for it can live ten or twelve days 
in the open air out of the water. I have alfo 
obferved, when I was fometimes in the month 
of September in the town of Petten, where 
thefe Snails are found in great plenty, near the 
fea piles or fea marks; that they ftuck quietly 
on the dry land, after the tide was out, and on 
its flowing, were again buried under the water; 
fo that they may, on this account, be confidered 
as real amphibious creatures. The 
wherein I exhibit this Snail, belongs to the 
fecond fpecies, and fhews its fafcie or wreaths 
nearly worn out. ‘The operculum or cover 
confifts of a flexible horny fubftance, fig. xix. g, 
which is compofed of filaments applied to each 
other, and rolled like the {piral convolutions of 
fome fhells. 
1 fhall give but a brief defcription of the in- 
ternal parts, both becaufe I employed only half 
a day in examining them, and becaufe they do 
not differ much from the entrails of other 
Snails. ‘To begin at the mouth, we muft ob- 
ferve, that all the parts of the jaws and palate 
are in this Snail of a bloody or purple colour. 
In the middle of the mouth is feen the tongue, 
Tab. IX. fig. xx. 4, included in a fingular kind 
of cavity, the whole of which it feems, may 
be extended together out of the body; in the 
refpeéts of colour and ftructure it does not 
differ much from the tongue, which I have 
delineated and defcribed in the Sepia or Cuttle- 
fith ; but it differs very much from the latter 
in this, that it is almoft two inches long, and 
at the fame time beautifully convoluted or 
twifted 7 into fpiral bendings, like a ferpent 
clofely rolled together, and is thus placed on 
the infide in the body; fo that it paffes with 
the gullet under the brain. The brain is fitu- 
ated behind the feveral parts of the mouth and 
palate, over the tongue and gullet, and ferves 
thofe parts before defcribed, as a kind of pully, 
through which they are tranfmitted. The part 
of the tongue which is in the body is cartila- 
ginous, and fo artfully and beautifully formed, 
that I could not delineate it fully in ten days; 
for which reafon I exhibit it only in its 
natural fize. In the hinder extremity the 
tongue is of a fofter texture, and there in- 
cludes a white matter in its cavity, which, 
when expofed to the air, dries away and va- 
nifhes, contrary to what happens in the upper 
part. The ufe of this tongue will be manifett 
thell f 
BOO K oof NAP GRE 3° ot, © 
to any perfon who inveftigates it with mofé 
experiments. . 
On either fide, near the tongue, are feen the 
falival du€ts, which arife from whitifh and 
branchy glandules, and reach to the jaws be- 
hind, under the proper parts of the mouth 
and palate ; and’ immediately under the gullet, 
two glandulous white little parts likewife come 
in view, the ufe of which I dco not know: 
under thefe, on each fide, are feen nerves 
iffuing out of the brain, of which the optic 
nerves are the moft confiderable. The eyes, 
for the ufe of which thefe are appropriated, 
have three fuch humours as I have before 
defcribed at large in other Snails; the only differ- 
ence is, that where the eye adheres to the skin, © 
it is furrounded with a kind of white narrow 
circle, which I have not indeed: obferved in 
other Snails. 
The ftomach likewife is provided in the fame 
manner, as itis in the garden Snail, and when 
it has decreafed into a {mall inteftine, it after- 
wards proceeds according to the convolutions 
of the fhell, and by its fpiral and pyramidal 
windings, furrounds the liver, which is of a 
dusky colour, fomewhat approaching to that 
of musk. The liver confifts of pretty large 
vifible glandules, which feem to communicate 
one with another, in form of a fhrub; as foon 
as this inteftine has paffed through the liver, 
and the whole circuit of the fhell’s convolu- 
tions, it forms the inteftinum rectum, or ftraight 
gut, wherein I have obferved the excrements 
divided into quadrangular globules. 
The heart with its auricle is fituated toward 
the left fide. All the blood veffels are of a 
whitifh colour, and refemble a Spider’s threads: 
this is a very great beauty in the inteftines of 
this little creature. I could not fee the facculus 
calcarius, or the calcarious bag, {nor the chain- 
like little part. Nay, feveral of the genital parts 
could fcarcely be diftinguifhed in this fubject, 
for I began this diffection and examination in 
the firft fpecies of thefe Snails, at the end of 
the year, that isin September. But the purple- 
bearing oblong little tube, together with fome 
of the other entrails, were diftinctly feen to be 
of a very elegant ftructure ; all which I muft 
pafs over now, and fhall refume this difleCion 
at fome other convenient time. 
Of the fmall water Turbo. 
Some {mall Turbines are commonly to be 
met with, Tab. X. fig. 1.2, in the places where 
the wonderful Snail, laft defcribed, is found. 
Thefe feem to agree entirely in ftructure and 
conftitution with the viviparous Snail, nor do 
they obvioufly differ from it, only that their 
fhells are fomewhat longer. I have not yet 
found them of fo large a fize as I could with, 
and as I have not them now alive, I cannot exhi- 
bit the figure of this creature, ] therefore hope 
that the benevolent reader will be fatisfied with 
the figure of its fhell only. 
of 
