134 Hiftory (/ANIMALS, 
brown, virgated Porcellana. 9. The blue, oblong Porcellana. 10. The blue, ob- 
long, fpotted Porcellana. 
4. Of thofe which have irregular gibbofities, there are, i. The milk-white Pored- 
lana, with a pale red lip, and red protuberances. 2. The white, gibbofe, fmooth- 
mouthed Porcellana. 3. The yellow, gibbofe, fmooth-mouthed Porcellana. 4. The 
dentated-mouthed Porcellana, with feven gibbofities on the furface, commonly known 
by the name of the Guinea-money. 5. The large, gibbated-backed Porcellana. 
S H E L L-F I S H. 
Clefs the Second. 
BIVALVES. 
'Thofe which have the external covering or Jhell compofed of two parts , 
or valves . 
O F thefe there are fix genera: 1. The Oftreae or Oyfters. 2. The Chamte; 
3. The Mytuli or Mufcles. 4. The Cardiae or Heart-fhells, among which are 
the Cockles. 5. The Pedtines or Efcallops, ufually called Scollop-fhells j and, 6. The 
Solenes or Razor-fhells. 
O S T R E A. 
T H E Oftrea is a fhell compofed of two valves: the lower one hollowed on the 
infide, and gibbofe without; the upper one more flat: both compofed of a 
multitude of laminae or crufts, and ufually fcabrous, or rough, on the outer furface. 
The fhells of fome of the Oftreae are fmooth, thofe of others furnifhed with tuber¬ 
cles, or with fpines, or deeply furrowed and plicated : the figure of moft is roundifh, 
but in fome it is quite irregular. 
Oftrea coftata y foliata, rofea et alba . 
The red and white , cofated and foliated Oftrea . 
This approaches to the fhape of the common oyfter; it is about three inches in dia¬ 
meter, and the lower valve is deep, the upper one nearly flat: it is all the way, on both 
valves, furrowed deeply in a longitudinal direction, with rounded but irregular ridges 
between the furrows $ thefe are numerous, but the greater part of them are naked ; 
about every fixth only is furnifhed with a feries of very elegant foliaceous prominen¬ 
ces, which are flat, curled, and jagged at the edges; they are from half an inch to 
three quarters in height, and are on both valves, but moft fair and entire on the up¬ 
per : the ground colour of the fhell is a rofe colour, with fome admixture of purple, 
variegated with white 5 the prominences are principally white. 
It is a native of the Eaft Indies. 
Xi)e foltateo 
Oftrea tenuis Icevis fubrotunda. 
The thin-) fmooth , roundijh Oftrea. 
%\yt onfott'Peel £>i»fret. 
This is a fpecies very Angular in it*s thinnefs and delicacy ; it is from an inch to 
two in diameter, and is extreamly different, in the feveral fpecimens, in the depth or 
gibbofity of the valves ; fometimes both are nearly flat, fometimes one is much hol¬ 
lowed, and fometimes both are fo: the furface of both valves is fmooth and glofly, 
and the colour whitifh, with a tinge of red or green on the outfide, and a fine pearly 
white, with more or lefs of the fame tinge within : it is frequently undulated in an ir¬ 
regular manner on the furface, and has a large roundifh opening near the hinge. 
It is a native of the Eaft Indies, and of fome parts of Europe. 
OJrm 
