250 OSTREA. 



O. nucleus comes very near this description, but it belongs 

 to the next subdivision, though its ears are nearly equal. 



pleuronectes. 6. Shell orbicular, with both valves 

 nearly flat ; outside smooth, and the inside 

 with about twenty-eight ribs. 



Ostrea Pleuronectes. Linnaus Syst. Nat. p. 1145. Born 



Mus. p. 99- Schroeter Einl. iii. p. 303. Gmelin,y. 3317. 

 Amusium Rutnphii. Chemnitz, vii. p. 284. t. 61. f. 595. 

 Bonanni Rec. 3. f. 354, and Kirch. 2. f. 108. Rumphius, 



t. 45. f. A and B. Petiver Gaz. t. 49- f. 13, and Amb. 



1. 17. f. 14. Gualter, t. 73. f. B. Klein Ost. t. 9. f.30. 



Knorr, i. t. 20. f. 3 and 4. Favanne, t. 55. f. E 1. Enc. 



Meth. t. 208. f. 3. 

 Inhabits the coasts of Amboyna and Batavia. Rumphius. Pu- 



lo Condore. Petiver. Molucca Islands. Chemnitz. 

 Shell generally about three inches in diameter, with the upper 

 valve reddish, marked with longitudinal darker lines in pairs, 

 and the lower valve white ; both valves are smooth, and 

 level on the outside, but the inside has about twenty-eight 

 longitudinal ribs, and is silvery. 



japonica. 7. Shell orbicular, with both valves 

 slightly convex ; outside smooth, and the in- 

 side with about forty-eight ribs. 



Ostrea Japonica. Gmdin, p. 3317* 



Ostrea, No. 2. Schroeter Einl.m. p. 323. 



Ostrea obliterata Var.? Kcemmerer Cab. Rudolst. p. 215. 



Amusium Japonicum. Chemnitz, vii. p. 288. t. 62. f. bQQ. 



Pecten pleuronectes Var. Solander's MSS. 



Enc. Meth. t. 208. f. 4. 

 Inhabits the coasts of China and Japan. Chemnitz. 

 Shell about five inches in diameter, and is nearly allied to O. 



pleuronectes, but is larger, coarser, thicker, and rather more 



convex, and the internal ribs are more numerous ; the colour 



is generally darker, and the inside of both valves has a yellow 



border. 



magellanica. 8. Shell orbicular, with the upper 

 valve rather more convex than the lower, and 

 striated longitudinally. 



Ostrea Magellanica. Gmelin, p. 3317- 

 Ostrea, No. 3. Schroeter Einl. iii. p. 323. 

 Amusium magnum Magellanicum. Chemnitz, vii. p. 290. 

 t. 62. f. 597. 



