. 



OSTREA. 261 



Pecten varius. Pennant Zool. iv. p. 101. t. 6l. f. 64. 

 Chemnitz, vii. p. 331. t. 66. f. 633 and 634. Montagu 

 Test. p. 146. 

 Pecten monotis. Da Costa Brit. Conch, p. 151. t. 10. f. 



1, 2, 4, 5, 7 and 9. 

 Lister Conch, t. 180. f. 17- t. 181. f. 18, and t. 189. f. 23 

 Rumphius, t. 44. f. C. Gualter, t. 73. f. C, I and N 

 and t. 74. f. G, H, R, S and T. Jrgenville, t. 24. f. H 

 Knorr, ii. t. 18. f. 3, and v. t. 11. f. 3, and t. 12. f. 5 

 Favanne, t. 54. f . B 3 and B 4. Enc. Meth. t. 213 

 f. 4. 

 Inhabits the coasts of Southern Europe. Linnmts. Barba- 

 does. Lister. Britain. Pennant, fyc. Mediterranean. 

 D'Avi/a. Adriatic. Ginanni. 

 Shell generally about two inches long, and one inch and three- 

 quarters broad, with the valves compressed and almost 

 equally convex ; the auricles are very unequal, and one is 

 commonly full four times as large as the other ; the ribs are 

 wholly or partially covered with concave spines or imbricated 

 transverse wrinkles, and the interstices are not longitudinally 

 striated as in O. sanguinea ; the colour is very variable, be- 

 ing sometimes of a uniform bright red, pink, purple, orange, 

 yellow, brown or white, and both the valves are frequently 

 beautifully mottled or striped with two or three of these 

 colours. 



sauciata. 31. Shell ovate, with numerous narrow 

 ribs alternately larger, and the margin cre- 

 nated ; auricles very unequal. 



Ostrea sauciata, Gmelin, p. 3328. 



Ostrea, No. 20. Schroeter Einl. iii. p. 331. 



Chemnitz, vii. p. 345. t. 69. f. H. 

 Inhabits the Red Sea. Chemnitz. 

 Shell about an inch and a half long, and an inch and a quarter 



broad, with the valves equal and of a whitish colour, with 



numerous scattered small purple spots. 



Pusio. 32. Shell ovate, with about forty filiform 

 transversely wrinkled ribs, and one of the 

 auricles minute. 

 Ostrea Pusio. Linnaus Syst. Nat. p. 1146. Schroeter 



Einl. iii. p. 314. Gmelin, p. 3324. 

 Ostrea pusilla. Gmelin, p. 33'i 1 . 

 Pallidum. Chemnitz, vii. p. 333. t. 67. f. 635 ? and 636. 



