OSTREA. 251 



Favanne, t. 55. f. E 2. Enc. Method, t. 208. f. 5. 



Inhabits the Straights of Magellan. Chemnitz. 



Shell four or five inches in diameter, and somewhat resembles 

 V. Japonica, but there are no ribs on the inside, and the out- 

 side is striated longitudinally, as also are the auricles trans- 

 versely. 



hybrida. 9. Shell with about nine narrow ribs, 

 and the interstices striated longitudinally ; 

 valves and auricles nearly equal. 



Ostrea hybrida. Gmelin, p. 3318. 

 Ostrea, No. 5. Schroeter Einl. iii. p. 324. 

 Pseud-Amusium. Chemnitz, vii. p. 298. t. 63. f. 601 and 

 602. 



Inhabits the coasts of Norway. Chemnitz. 



Shell about an inch and three quarters long, and the length ra- 

 ther exceeds the breadth ; the upper valve is reddish, varie- 

 gated with white veins, and the lower valve is wholly white ; 

 both the valves are thin, slightly convex, and flattish at the 

 margin. Chemnitz and Gmelin have quoted Lister, t. 173. 

 f. 10., but it is more like O. obliterata. 



radula. 10. Shell ovate, depressed, with about 

 twelve convex ribs, and decussated crenated 

 striae. 



Ostrea Radula. Linnceus Si/st. Nat. p. 1145. Born Mus. 



p. 100. Schroeter Einl. iii. p. 304. Gmelin, p. 3318. 



Barbut. Verm. p. 54. t. 8. f. 2. 

 Ostrea crenulata. Gmelin, p. 3329- 

 Ostrea, No. 30. Schroeter Einl. iii. p. 334. 

 Pera Venatoria. Chemnitz, vii. 295. t. 63. f. 599 and 600. 

 Lister Conch, t. 175. f. 12. Rumphius, t. 44. f. A. Peti- 



ver Amb. t. 17- f. 1. Gualter, t. 74. f. L. Argenville, 



t. 24. f. D. Knorr, v. t. 9- £ 4. Regenfuss, ii. t. 4. f. 



40. Favanne, t. 55. f. C. Enc. Meth. t. 208. f. 2. 

 Inhabits the coasts of Amboyna. Rumphius. Molucca Islands. 



Chemnitz. Tranquebar, and China. Humphreys. 

 Shell about three inches and a half long, and three inches 

 broad ; white, variegated, and the ribs sometimes regularly 

 spotted with brown ; the lower valve is rather more convex 

 than the upper, and the ears are wrinkled and striated 

 obliquely. 



