OSTREA. 257 



Shell two inches and three quarters long, and the breadth is 

 about a line less, with the valves convex and equal; the out- 

 side is brown marbled with red, violet, and white, and the 

 inside is pale violet, bordered with reddish brown. 



citrina. 22. Shell with about twenty rounded 

 transversely wrinkled ribs, and the lower 

 valve flatter than the upper. 



Ostrea citrina. Gmelin, p. 3327. 



Ostrea sanguinea, Var. 0. Kammerer Cab. Rudolst. p. 

 218. r 



Ostrea, No. 11. Schroeter Einl. iii. p. 327. 

 Pallium ex citrino vividissime coloratum. Chemnitz, vii. p. 



321. t. 65. f. 618. 

 Valentyn Abh. t. J 3. f. 1. 



Inhabits the East Indian Seas. Chemnitz. 



This shell is said to have some of its rays scaly, and some 

 of the interstices marked with granuhited stria?; in form and 

 size it resembles O. Senatoria, of which it most probably is 

 nothing more than a variety ; it differs in being of an orange 

 colour, and in having one valve rather flatter than the other. 



pellucens. 23. Shell ovate, depressed, with about 

 nine narrow scaly ribs, and the interstices 

 striated longitudinally ; one of the auricles is 

 minute. 



Ostrea pellucens. Linnaus Syst. Nat. p. 1 146. Gmelin 

 p. 3323. 



Ostrea squamosa. Gmelin, p. 33 19. 



Ostrea anonyma. Gmelin, p. 3329. 



Ostrea, No. 13. Schroeter Einl. iii. p. 328, and No. 25. 

 p. 336. 



Ostrea. Chemnitz, vii. p. 326. t. 66. f. 625 to 627. 



Lister Conch, t. 184. f. 21. Enc. Meth. t. 213. f. 6. 

 Inhabits the West Indies. Humphreys. 

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



broad ; reddish or white, and the upper valve spotted ; one 



valve is smooth, and the other has minute vaulted scales, and 



one of the auricles is much larger than the other. Linnaeus 



has not quoted any figure besides Argenville, t. 24. H, which 



is O. varia. 

 vol. i. c 



