have th’eir incurvation more acute, and their teftaceous part fo
covered with an epidermis pointed with very fmall circlets, that
correfpond cxadly in Fig. M , N, to that already defcribed Fig.
E. But the greateft difference, that charadterifes this fecond
fpecies, confifts in its ornament o f eighteen tufts or toffels, o f
a filver colour, compofed o f filaments refembling Amianthus.
Thefe arife at the juncture of the vertebra, and ferve, as it
were, for a bafe to the fwardy pyramids above mentioned. Reckoning
in this manner, the toffels ihould be only fix teen, as the
fpoil of the articulated patella is compofed only o f eight parts .;
but they have two which are fomewhat fmaller than the others
at the anterior extremity. ‘ The fig. O reprefents the fixth part
o f one o f thofe toffels magnified, and the columner hexagon P
ihews one o f the filaments feen through a greater magnifier. I
cannot imagine what ufe the animal makes o f this apparatus.,
Linnaeus defcribes this fhell, and makes it an inhabitant of the
coaft of Barbary, at No. IV. o f the Chitoni. His defcription,
however, does not give a fufficiently precifeideaof the ftruiture
o f the animal, and is not very exadt in the number and difpo-
fition o f the toffels, nor about the colour .of the fhell, its arcu-
ation, S e e .* . One very rare fpecies o f fafciated chiton, with
only fix articulations, I found on re-examining my colledion,
after my return from this tour.; and it is reprefented by the fig.
But, among more than a hundred oclovalue chitons, colledted
with a good deal o f pains, I could find only this fingle fpeci-
men.
A n
* Chiton tejla oftovali cor pore ad valvas utrinque fafciculato.
Habitat in Barbaria,
Corpus cinereum, lave. Teftse leviter carinatse. Fafdculi pilorum totidem,
albidi, juxta teftarum latera corpori inildent, Linn, Syft, Nat,
An infinite number o f other curious living creatures propa--
gate in the little openings o f the port o f Biia;' among, which I
make no doubt these! are-many, that '-wo.nid prove new to the
naturalifts; but miivdi attention,..isr.requhed to obferve them in*
their various ftates; much, timeitodifcGiver-their nature,- and
different qualities ; .a dong examination--of f books .not very common,
and o f farraginouS colleitiofes ;-in ordqr toibe certain, that,
they have not, been, already defcribed1 by* writers joA marine .natural,
hiftory. II have Sketched the hiftory o f feveral,- but without
intention,of publifhing it,)till time.and opportunity enable
me to render it- more,complete. .
Of the Sea-Coajf* of 'I r ’-au SpAt o f ihe:’'
The fea coaft o f Trau, .to the eaftward, is well cultivated, but
not exteniive. It reaches to the foot o f the, mountains, yet hardly
in any part exceeds a mile and a half in breadth, including the.
plain, and the cultivable part o f the mountain.
At two - miles diftance from the city, there arifes, from the
roots o f mount Carpan, a confiderabie ftream o f water, whi-ch
would form no ignoblfe river, i f it had a longer courfe, and did
not,, almoft’ as foon as it iffues from the fubferraneous caverns,
loofe itfelf in.a fait pool, which- fomewhat hurts the air’of Trau.'
The rocky maffes, from which this large "fpring arifes, are
of hard lenticular ftone ; the middle part of the mountain is an
argillaceous light-blue earth, in fome places more, and in others
lefs concrete,; and the furrimit is of' common whitiih marble,
Breccia and Numifmales., indeterminately, as may be inferred from-
the gravel that defcends with the eventual ftreams o f rain water,
B b and