ibe i Se yOsY 40! GIN S) HAC TS. 67 
with Mr. Thevenot, and Mr. Stenon, found 
feveral {mall Crabs in the river Seine, in the 
bones of . fome ox’s skulls which had been 
_thrown into that river. 
‘The thell in which the Hermit abovemen- 
tioned lies, is on the infide twifted into the like 
windings as the operculated Wilk ;' I fhall there- 
fore omit its figure inthis place. But that the 
diverfity of the windings may be known, in 
fome meafure, in other fhells, I fhall now re- 
prefent the inward windings of the turbinated 
kind. The common Turbo is ofa very elegant 
ftructure; it begins at the bafis with broader 
windings, Tab. VII. fig. 1. a, and, rifing by 
degrees obliquely, like a circular ftair-cafe, con- 
verges into an acute point J, and thus forms 
various’cells and lodgments. 
But the figure of the Voluta, or that called 
the Cylinder Snail, is much more beautiful, be- 
caufe the convolution or winding is more com- 
plicate and intricate; its entrance, fig. 11. 2, grow- 
ing narrower dby degrees, forms another round c, 
which afterwards, being {till twifted or convo- 
luted d round its pillar, produces beautiful and 
regularly {piral tendrils, which grow narrower 
by degrees, and at length are loft. This ftructure 
truly merits admiration, for all things are there 
fo beautifully divided and feparated by inward 
divifions and cells, that they exhibit a labyrinth 
of miracles, into the inward cell of which we 
cannot obtain admittance, unlefs we firft pafs 
round all thefe windings. Nor can any one 
difcover its wonderful elegance, unlefs guided 
by the Ariadnean thread of an unwearied re- 
' fearch into the works of God. The Aimighty 
gives knowledge as the price of labour, which 
the heathens themfelves have declared. 
No lefs admirable are the finufes of the 
Concha Veneris, with which the women in 
Hoiland adorn the ftrings tied to their keys, 
and polifh their whitened linen after bleaching. 
This fhell is conftructed with various convolu- 
tions, and unufual and amazing windings, like 
tendrils; and toall thofe convolutions of the in- 
ward part of the fhell, the body is fitted and 
made to agree by its bendings and windings. 
T have already explained in the Snail before 
defcribed how this is done. Its entrance, Tab. 
VII. fig. 111. a, is beautifully fortified and di- 
vided into little teeth like thofe of a faw; fuch 
as are likewife obferved to be placed on the 
infide about each winding, as far as the extre- 
mity 4 of the fhell, which terminates in a very 
fharp and {mall point. But all thefe remark~- 
able things cannot be exhibited in a fingle 
figure. 
In the Penicilli Marini, which the French 
call pencils or plumes, the moft wife architect 
has difpofed their windings in a very diffe- 
rent manner: they begin in the orifice, 
fig. 1v. 2, of the Penicillus, and infenfibly form 
another lodgment or apartment, with their 
notched or denticulated bendings; then as it 
were, diminifhing by degrees, and rifing again 
with broader convolutions, they form a third 
lodgment ¢ ; afterwards they decreafe more and 
more, and make a fourth d, fifth e, fixth fj 
and feventh g compartment. The laft is like 
a little {tring or tuft of filaments, and is pro- 
perly the firft rudiment from which the Peni- 
cillus begins to increafe, and whence, by a gra~ 
dual augmentation, it acquires or raifes all the 
reft of the compartments. | 
Inthe cabinets of the curious, there is kept 
a certain {pecies of Snails, which agrees in its in- 
ternal conftruction, well enough with the Cornu 
Ammonis. This confifts of a fimple little tube, 
fig. vir. a, rolled into itfelf, very large before, 
narrower behind, and ending in a very {mall 
point. It differs from moft other thells of 
Snails, becaufe it is divided on the infide into 
numerous compartments, by delicate partitions, 
which are tranfparent even on the outfide, 1, 
2, eee ae Soren in iwtne: fore end, ‘the 
partition which is hollow like a faucer, is naked 
or plain to the eye, and has a {mall hole pierced 
through it therea*. If this holé be accu- 
rately viewed, it is found actually to open into 
the tubular appendage of the partition, which 
appendage or tube is inferted in the opening of 
the fecond partition, and the tube of the {- 
cond into the aperture of the third, the third 
into the fourth, and fo afterwards to the end 
of the hell. 
All thefe things appear plainer, if the out- 
ward fhell of the Snail is picked off; for then 
the ftories or partitions, Tab. VII. fig. vi11. bb, 
fituate in the Snail’s tube, are feen very plain- 
ly, as well as the little tube or fiphunculus, that 
reaches from the firft partition to the aperture 
and tube of the fecond, and the tube of the 
fecond to the third, and fo to the extremity of 
the Snail: all which may be feen about the 
inward fide of the curvature c of this creature 
very diftinély. But fince thefe things cannot 
be fo diftinétly exhibited or underftood under 
its natural fize, I have thought it advife- 
able to reprefent, of thefe, feveral partitions 
confiderably magnified ; in which figures, the 
acetabulum or partition appears firft in its com- 
pais, fig. 1x. ddd, and on the infide its inward 
fold, hollow like a fpoon. On the upper part 
of this is feen e a little aperture formed with 
the moft exquifite art. Behind this aperture 
is feen the tubular appendage of the acetabu- 
lum or partition, which, on the upper and 
lower fide of that partition, is ftretched out, 
like the crooked handle ont of a certain {poon, 
and is received very exactly into the aperture 
and tubular appendages of the partition, fig. x. g, 
and this again into the aperture and tube of the 
third /. 
* All Nautali are of this flru€ture, as alfo the Arthoceratilz, as well as Cornua Ammonis, which are found petrified, being inha- 
bitants of deep feas ; whence they are never got up living, nor ‘the fhell feen recent. In the large thick Nautilus, thefe parti- 
tions are forty or more in number, and there runs through them all a pipe; this is called the fiphunculus ; the animal within is 
of the Sepia or Cuttle-fifh kind. In the Arthoceratile they are more numerous. We fee this fhell-foflil in the red ones called 
Swedes paving, and ufed in court-yards, and for flat walks. 
What 
