OSTREA. 
ftriz, and tranfverfe interrupted bands ; margin crenulate. 
This is a very {mall {pecies. 
InnominaTA. Shell roundifh, f{potted, with deep 
grooves very finel ae afer ; margin crenulate. 
One of the ears hardly vi 
. Shell sud pale rufous, with 24 rays ; 
the ears with-decuflate frie. ‘This {pecies is of a middle 
fize. 
MATA. Shell roundifh, with thick rays Tes The 
efi 
the interftices broader and ftriate naeae cularly ; ears with 
perpendicular wrinkles. The fhell is varied with angular 
lines and {po 
E Shell flattened, with ten fmooth flat 
unequal rays 5 3 ears tranfverfely ftriate 
TENU ll thin, with depreffed fcaly rays; ears 
fhort. Ti is found in India and the North feas. The fhell 
is bay, or cinereous sai with black, fometimes white or 
carmine, or pale oran 
Vacentit. Shell with 20 rays, and tranfverfe femilunar 
bands. Itisfoundin India. The-fhell is red; it refembles 
the O maxima, but the ears are unequa 
a. Shell fomewhat oblong, with crowded rays. 
Sheil copes es reddifh, faffro n or pie CeOus. 
Crocea. Shell faffron, with muricate fcaly rays alter- 
nately lefs 
Frorip Shell er re white, with rofy {pots 
Ocunoteuca. Shell oblong, ochraceous, with rays 
fmox Fae on one part and oe on the other. 
INA. Shell pale tawny, with yellow fpots and 
ba oe aca {mooth rays; ears tranfverfely ftriate. The fhell 
is 22 inches long, and about as much bro 
MEA. Shell faffron, rather oblong, with very fine 
perpendicular f{triz. 
Incaryata. Shell rather oblong, flefh-colour, with 
inter rupted red bands and flattened rays. Thisis {mall. 
Guttata. Shell yellowith, ro nded, dotted with red, 
with rays unequally converging at the hinge. It is {mall. 
Derressa. Shell oc — with flat bifid rays. The 
fhell is abcut an inch long, omething broader. 
Shell eae asap red, ‘with rounded rays. 
The ear of the lower valve deeply emarginate. 
equivalve, with numerous {mooth rays. 
allium, but is lefs rough, and fewer 
rays; fhell ftraw-colour with purple undulate ban 
Ses EMINUDA. Shell orange, oblong, ae with 
fcales as far a the middle ; with 22 rays. ell is 13 
inch long, 14 broad; ears with very fine fcales. 
Nope. Shell roundifh, hoary, with brownifh, reddith, 
and blueifh fpots; fpaces between the rays br oad. The 
fhell has two filiform bands at the hin nge. 
Principauis. Shell purple, with a brown eel a the 
rays fcaly from the middle and fmooth at the hin 
Versicotor. Shell variegated, with ee {mooth 
rays. * 
c. Valves more gibbous on one fide. 
Fravicans. Shell nearly equivalve, with eight itriate 
fide. Iti 
s found in the 
ears very 
S hell equivalve, with 2c rough rays, the in- 
terftices ftriate ears equal, {mall. Inhabits the American 
.. but is rare ; “fve inches 
oe Atlantic feas. The fhell is ad bars gaping 
ach fide, very finely ftriate within ; the crenate : 
FRA Geitis. Shell aoa ae margin very 
entire; ears acute. It inhabits the "Riecbar iflands ; re- 
fembles the laft, but is flatter, ne has more rays ; fhell thin, 
brittle, 1d inch long, and about half as broad. 
MA. ell equivalve, with 22 imbricate carl rayes 
at one margin; ears obliterated. It is found i 
the Mediterranean, Indian, and Red feas. The fhell three 
inches long, 24 broad ; white and ravher flat; the number 
rays un neertain, ie fcales elevated and acute ; ears 
Shell aes with 50 imbricate inter- 
3 ears equal, on aited, 
more numerous rays ; {hell sat with a crenate margin ; 
another variety has the margin entire. 
Hians. Shell whitifh, thin, gaping each fide and oblique, 
with obfolete undulate rays, and tran{verfe rounded femilu- 
nar ftrie. Inhabits Norway; 14 inch long, 2 of an inch 
broad ; ears very {mall and acute ; margin crenate, very en- 
tire w it i 
ae dirty-white, with longitudinal undu- 
a a few tranfverle rings, {moot within ; one 
ear obfolete ; misters very entire. ound in Norway, 
slong, 34 
B. Rough and generally ae on the outfi a Oyfters. 
Shell ede te ye eee two of the lobes 
the valves lamella 
VALSELLA. Shell fubpellucid, cal elongated, brittle, 
lamellate ; one end rounded ; wit eh yee and glo 
It inhabits the Red fea ; 3 34 Gicheg lo on road. The 
ell is violet, tawny, or ferraginout, gsbing at the hinge ; 
rough on the outfide, and thinner at the ro 
ANATINA. ell pellucid, lamellate, and laterally in- 
It inhabits ie Nicobar iflands ; about an inch 
ing the curvature three inches ae 5 its 
fhape in fome meafure refembles a duck when fitting ; fhell 
thin, peli varied with white and violet. ; 
ANA. Shell plaited on the ontfi de; the margin 
he pee acutangular teeth. This is found ina foffile ftate 
n the calcareous mountains of Sweden, about the fize of a 
common oytter ; the margin with ere& ferratures, formed a 
it were of the imbricate lamelle of the thell, and tranfveriely 
ftriate ; valves with peCtinate plaits and acute wrinkles. 
Shell ovate, obtufely plaited at the fides, pa- 
It inhabits the Indian ocean, where it is frequently 
found adhering to Gorgonia; fhell ftraw-colour, pale e tawny, 
or violet, within filvery; hinge with a anguke hollow 
upper valve turgid on the back towards the middle, wrinkled 
each fide and tranfverfely ribbed ; lower valve lefs flatter and 
grooved in the midd 
OR agar 
FoLtum. 
eC. 
Shell orbicular, flat, with an entire cre- 
eftee 
rugged, with a imbric ate {cales 5 
ire. There are fix varieties of ‘de yee found in 
different parts of the Pies and Indian feas, affixed to 
vi, 
