258 OSTREA. 



obliterata. 24. Shell orbicular, compressed, 

 with forty-eight narrow ribs on the inside, and 

 the outside smooth. 



Ostrea obliterata. Linnceus Si/st. Nat. p. 1146. Schroe 



ter Einl. hi. p. 31 1. Gmelin, p. 3323. 

 Ostrea tenuis. Gmelin, p. 3320. 

 Ostrea, No. 44. Schroeter Einl. iii. p. 338. 

 Pecten glaberrimus. Chemnitz, vii. p. 324. t. 66. f. 622 to 



624. 

 Gualter, t. 73. f. C. Regenfuss, ii. t. 2. f. 12. 



Inhabits the Southern coasts of Europe. Linnaus. Molucca 

 Islands. Chemnitz. 



Shell about an inch and a half long, and very nearly or quite 

 equally broad ; the upper valve is generally of a dull red 

 marked with very fine darker longitudinal lines, and a few 

 transverse striae ; the lower valve is pale rose colour, and both 

 valves are white on the inside ; the auricles are nearly equal, 

 and the shell bears some resemblance to a small specimen of 

 0. pleuronectes. 



tigerina. 25. Shell sub-orbicular, with crowded 

 minute longitudinal striae, and the valves near- 

 ly equal. 



Ostrea tigerina. Gmelin, p. 3327- 



Pecten tigerinus. Muller Zool. Dan. ii. p. 26. t. 60. f. 6 



to 8. 

 Pecten domesticus. Chemnitz, xi. p. 26 1. t. 207- f. 2031 

 to 2036. 



Inhabits the coasts of Denmark, on Fucus saccharinus. Muller. 



Shell about an inch in diameter, and the length and breadth are 

 equal ; the colour is reddish, irregularly spotted with brown 

 on the upper, and dotted on the lower valve ; the striae on 

 the upper are also thicker than on the lower valve, and the in- 

 side is striated, and appears tinged with the same colours as 

 the outside. Chemnitz has not quoted Muller's P. tigerinus, 

 but there can be no doubt that it is the same as his P. do- 

 mesticus. 



fuci. 26. Shell sub-orbicular, striated longitudi- 

 nally, and armed with small spines towards 

 the margin; valves nearly equal. 



Ostrea Fuci. Gmelin, p. 3327. 



Pecten striatus. Muller Zool. Dan. ii. p. 26. t. 60. f. 3 

 to 5. 



