68 The Be Or Onis 
What has been hitherto faid, is far from 
completing the artificial ftructure-of this won- 
derful Snail: for as this Cornu Ammonis be- 
comes fmaller by degrees, fo do its partitions, 
and their tubes zzz become lefs, until at length 
they become invifible. I obferve likewife, that 
thefe tubes of the partition are not connected 
together, but are only contiguous, and are put 
into each other, in the fame manner as the 
tubes of telefcopes, which receive each other 
in fuch a manner as to be. freely moveable. 
But on the contrary, the acetabula or partitions 
themfelves increafe with the Snail’s thell, and 
are united to it. I preferve fome of thefeace- 
tabula, which fhew their very elegant ftructure, 
if their tubes are joined together; for which 
purpofe, and that they fhould not be eafily 
loft, I keep them together bound with a filver 
thread. 
This Snail therefore agrees with all others 
in regard to its ftructure, and its thell confifts 
of one crooked tube. It differs, however, 
from the reft only in that the apartments or 
cells are placed in a different manner, and have 
perforated handles: thefe may be faid to form 
the pillar of this Snail, fince they exactly re- 
ceive each other. 
I never faw this fhell with its Snail but 
empty only in my father’s cabinet. I fhould 
therefore be very glad to know, by what means 
the body of this little creature, which inhabits 
that fhelly houfe, is placed there, and whether 
it extends through all thofe apertures from cell 
to cell, and is interfected, as it were, in fo 
many places; or whether it lives only in the 
extreme apartment, and is inferted with its 
muf{cles in the tubes of the fhell. But how- 
ever much I wifh to be gratified in this parti- 
cular, I thall never, probably, accomplifh my 
defire. It would therefore be proper for thofe 
who vifit foreign countries, for the fake of 
commerce, to import fuch things; for though 
they have never ‘fo little curiofity or tafte for 
thefe ftudies, they ought to endeavour to make 
the works of God manifeft to pofterity, and 
by due care they might profit more than by 
any other means whatfoever. 
The great Indian Nautilus is nearly of the 
fame ftru€ture with the Cornu Ammonis, and 
therefore I had once thought to give its figure 
in this place: but fince it is found in many of 
the cabinets of the curious, and of the fame 
ftru@ture with this, I fhall defift from my 
intended purpofe, and the rather, becaufe the 
celebrated Aldrovandus has left us a pretty neat 
and exact figure thereof. 
Let it fuffice, that Ihave annexed the figures 
of the two tubular Snails, or teftaceous tubes 
already defcribed, which afford an example, 
from which the manner of conftructing all the 
fhells of Snails may, in fome meafure, be un- 
derftood. All the difference obferved between 
them arifes from the variation of their convo- 
of “Nv AYIA UW RR 
or, ; 
lutions only: to which, if we further add 
fome outward ornaments of ridges, hollows, 
windings, plains, tubercles, depreffions, exten- 
fions, impreffions, and colours ; and laftly, that 
the cavity of the pillar fometimes grows together 
entirely, as I have likewife fometimes obferved 
in the fhell of the garden Snail; it is then eafy 
to reduce all the geometrical figures, curves, 
oblique and right angles, in all kinds of Snails, 
to one {pecies, that is, to an oblong tube, which 
is curved, curled, or bent in and out, and grows 
in this ftate. ash, 
The tubular fhell-fith before-mentioned*, 
exhibits the moft fimple articulation of all the 
kinds, for in their beginning they are ftretched 
out, like a plain tube, Tab. VII. fig. v. a, or 
little inteftine, and are turned or bent round 
moftly near the end 4. And hence arifes that 
cavity, fig. vi. c, whereof I fpoke, when I 
treated of the cavity of the pillar, But thefe 
tubular creatures grow together, fometimes ten 
or twenty, in fo perplexed a manner, that no- 
thing certain can be diftinguifhed concerning 
them, fince nothing appears to our view but 
ends or tops, windings and little apertures. 
I thall further add, that almof all kinds of 
Snails and fhell-fith are twifted towards one and 
the fame fide; nor can many be found, at leaft 
very feldom, the convolutions whereof go, 
Tab. VII. fig. x1. @, in a direction contrary to 
the others. In 'fome fpecies of oval ‘Turbo’s, 
and fome others, this is fometimes found ; and 
fuch fhells, for this reafon, that they are 
lefs common and more efteemed, are carefully _ 
kept in the cabinet of the curious, 
The little Turbo. 
I found fome years agoa {mall Snail between 
the bark and wood of an old willow-tree, the 
thell whereof refembled a fea Turbo, and from 
a fomewhat broad beginning, terminated Tab. 
VIII. fig. 1. a, infenfibly in a fharp-pointed 
top. This Snail is never feen in the day time, 
except in rainy weather; it then always hides 
itfelf under the bark, or in other fhady places, 
and refting there, it faftens that part of its 
fhell by which the body creeps forward, to 
the wood, the other acute extremity being ob- 
liquely directed upwards. The fhell of this 
Snail is likewife curled or convoluted in an in- 
verfe manner; and what merits great notice is, 
that its genital organs are placed in the left fide 
of its neck, in an order contrary to all other 
Snails. But I have fometimes obferved the 
convolution of the fhell to be inverted in the 
Purple-fith. It is therefore probable that what- 
ever Snails have their fhell twifted in an in- 
verted manner, have likewife their genitals in 
the fame fituation. 
I have very feldom feen this Snail with its 
fhell larger than I have expreffed it in the figure , 
nor have I found that part d of its body, which — 
* Thefe are called Tubuli Marini by authors: they are fimple and plainly hollow. Some are ftraited, and others fmooth on 
the furface ; fome perfeétly ftrait, others twifted at the end. ‘’hey are found Ieofe on the fhore, and ledged in folid fubftances. 
The animal within is atrue Snail. — 
‘ 
creeps 
