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WORMS. TESTACEA. 66. Oftrea. 27 
Born Muf. Cef. Vind, tef. tab, 6. f. 9, 1o. 
Chemn. conch. 8. tab. 73, fig. 672, 673. 
3. Martin alle. Naturf. 4. tab. 48, f. 3, 4. 
4. Chemn. conch. 8. tab. 71, f. 660? 
5. Chemn, conch. 8. tab, 71, f. 661. 
6. Chemn, conch. 9. tab. 116, f. 994—996. 
Inhabits Ezrepeam and Indian feas, affixed to rocks or in large, 
beds: the fifh is well known as a palatable and nutritious 
food; /bell of various fizes, forms and colours, within white 
and often glofIy like mother of pearl: the old fhells have often 
an Anomia fixed to them, and are frequently covered with 
Serpulz, Lepades, Sertulariz and other marine productions. 
Semiaurata Shell oval, flightly eared, fmooth, with an oblique bafe. 
Gualt, test. tab. 84. fig. H. 
Schrat. einl. in conch. 3. tab. 6. fig. 6. 
Inhabits the Mediterranean, about 14 inch long and ii broad: 
dirty olive with a few undulate white lines: very thin ; each 
valve convex and ending in a beak: Asmge with 5 rounded 
hollows, 
*Striata, Shell oval with longitudinal filiform ridges: infide green. 
Donovan's Britifh fhelli, ii. tab. 45. 
Da Cofia Brit, conch. tab. 11, figs 4e 
Lifter An, Ang. tab.4. fig. 4. 
Gualt. couch, tab. 104, fig. B? 
Inhabits European feat ; about an inch in diameter. 
Shel] thick, ftrong, nearly opake, not membranaceous as in the 
common oyfter, with numerous flender irregular ridges di- 
vided towards the bottom: upper-valve flattifh, lower con- 
cave: Ainge broad, deep, fomewhat triangular and ftriate 
tranfverfely. In many fhells is a white radiate mark below 
the hinge, formed by the cartilage of the fifh, 
Firnicata, Shell rough, oblong, linear, with divergent hinges vaulted 
internally. 
Chemn conch. 8. tab. 71. fig. 667. a, b. 
Inhabits the Red Sea, Shell brittle, membranaceous, tawny, 
about as long as a finger, terminating at the hinge in an clon- 
gated acutangular beak. 
Sinenfis, Shell rough, lamellate, unequal and glabrous within: lower- 
valve larger, concave and ending in a beak, with ro 
obtufe plaits. 
Chemn conch. 8. tab. 72. fig. 668. 
Inhabits Chinefe fhores; 4 inches long and a little narrower : 
fell raflet-brown, within whitifh towards the hinge, 
Mm 2 Spon - 
