252 OSTREA. 



imbricata. 11. Shell ovate, flattish, with about 

 nine ribs, which are alternately larger, and 

 furnished with imbricated scales. 

 Ostrea imbricata. Gmelin, p. 3318. 

 Ostrea, No. 4. Schroeter Einl. iii. p. 324. 

 Pera venatoria imbricata. Chemnitz, vii. p. 298. t. 69. 

 f. G. 

 Inhabits the Red Sea. Chemnitz. 



This shell is of about the same size, and is said to be nearly al- 

 lied to O. Radula ; it is whitish, with purple spots, and has 

 the margin slightly crenated. 



plica. 12. Shell sub-orbicular, with about six con- 

 vex ribs, and striated longitudinally; auricles 

 equal. 



Ostrea plica. Linn am Sj/st. Nat. p. 1 145. Bom Mus. 



p. 101. Schroeter Einl. iii. p. 305. Gmelin, p. 3318. 

 Ostrea rosea. Gmelin, p. 3319. 

 Ostrea, No. 40. Schroeter Einl. iii. p. 337. 

 Pecten plicatus. Chemnitz, vii. p. 292. t. 62. f. 598, and 



xi. p. 263. t. 207. f. 2041. 

 Bonanni Rec. and Kirch. 2. f. 10. Rumphius, t. 44. f. O. 



Petiver Amb. t. 2. f. 10. Jrgenville, t. 24. f. C. Fa- 



vanne, t. 55. f. A, 3. 

 Inhabits the coasts of Amboyna. Rumphius. Indian Ocean. 



Linnaus. 

 Shell about an inch and a quarter long, and the length but very 

 little exceeds the breadth ; besides the longitudinal, it has also 

 a few remote transverse stria?, and the inside has longitudinal 

 striae in pairs, corresponding with the ribs on the outside ; 

 the colour is reddish brown, clouded or rayed with white, or 

 sometimes white is the prevailing colour ; there is some ap- 

 pearance of teeth on each side of the hollow which receives 

 the cartilage. 



pes-lutra. 13. Shell somewhat wedge-shaped, with 

 six convex ribs and longitudinal striae ; auri- 

 cles small and unequal. 



Ostrea Pes-Lutra. Linnaus Mantissa, p. 547. Gmelin, 



p. 3339- 

 Ostrea coarctata. Born Mus. p. 106. 

 Pecten plicatus Var. ? Chemnitz, vii. p. 294. 

 Lister Conch, t. 17 1. f. 8. Gualter, t. 74. f. C C. Argen- 



ville, t. 24. f. A. Knorr, ii. t. 21. f. 5. 



