260 OSTREA. 



Gronovius. Red Sea. Forskael. Mediterranean, and the 

 West Indies. Chemnitz. 

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

 broad ; the colour is bright scarlet, orange, or citron, not 

 often much variegated, but sometimes becoming whitish to- 

 wards the margin : I have followed Kaemmerer in placing 

 P. sulphur eus, and P. aurisicanus of Chemnitz as Varieties 

 of this species. 



porphyrea. 29. Shell sub-orbicular, with about 

 twenty-five scaly convex ribs, and the valves 

 nearly equal. 



Ostrea porphyrea. Gmelin, p. 3328. 



Ostrea, No. 16. Schroeter Einl. iii. p. 329. 



Pallium porphyreum. Chemnitz, vii. p. 330. t. 66. f.632. 



Inhabits the Red Sea. Chemnitz. 



Shell about two inches and a quarter long, and the length and 

 breadth are equal ; the colour is bright red or scarlet, varie- 

 gated with a few white spots, and the inside is white or 

 sometimes red ; the valves are almost equally convex. 



varia. 30. Shell ovate, with about thirty narrow 

 elevated ribs armed with vaulted spines, and 

 the interstices transversely wrinkled ; auricles 

 very unequal. 



Ostrea varia. Linneeus Syst. Nat. p. 1146. Born Mus. 



p. 104. Schroeter Einl. iii. p. 313. Gmelin, p. 3324. 



Donovan, i. t. 1. f. 1. Maton and Racket, in Lin. 



Trans, viii. p. 97. Dorset Cat. p. 38. t. 10. f. 1, 2, 4, 



5, 7 and 9- 

 Ostrea muricata. Gmelin, p. 3320. 

 Ostrea aculeata. Gmelin, p. 3320. 

 Ostrea punctata. Gmelin, p. 3320. 

 Ostrea subrufa. ^Gmelin, p. 3329. 

 Ostrea tenuis. Gmelin, p. 3329. 

 Ostrea ochroleuca. Gmelin, p. 3330. 

 Ostrea mustelina. Gmelin, p. 3330. 

 Ostrea flammea. Gmelin, p. 3330. 

 Ostrea incarnata. Gmelin, p. 3330. 

 Ostrea versicolor. Gmelin, p. 3331. 

 Ostrea, No. 32. Schroeter Einl. iii. p. 335, No. 43. p. 



338, No, 47. p. 339, No. 51. p. 340, No. 52. p. 340, 



No. 57. p. 341, No, 58. p. 341, No. 59. p. 341, No. 



60. p. 342, and No. 89. p. 350. 



