CO^CHYLIX—DITHYRA. 46. 209 



Pecten testa subobliqud longiliidinaliier striatd, valvd supe- opercuiaiii. 



riori convex iori, radiis 18 ad 20 subvarinatis scabris. 

 Shell rather oblique and striate longitudinally, the upper valve 

 more convex, with 18 to 20 rays which are somewhat carinate 

 and rough. 

 Ostrea opercularis. Linn. Syst. Nat. p. 1146. 



Gmelin, Syst. p. 3325. 



Turton, Linn. Syst. iv. p. 266. 



Linn. Trans, viii. p. 98. 



Dorset Catal. p. 38, tab. 9, fig. 1 , 2, 4, 5. 



Dillwyn, Descript. Catal. p. 266. 



Turton, Conch. Diet. p. 129. 

 Pecten opercularis. Pennant, iv. p. 221, tab. 63, fig. 2. 



Chemnitz, vii. p. 341, tab. 67, fig. 646. 



Montagu, Test. Brit. p. 14.5. 



Turton, British Fauna, p. 161. 

 Pecten pictus. Da Costa, p. 144, tab. 9, fig. 1, 2, 4, 6. 

 Pecten niediocris. Lister, Conch, tab. 190, 191, 192. 

 Var. radiis lined sanguined longitudinali pictis. 



the rays marked each with a longitudinal red line. 

 Ostrea liueata. Donovan, British Shells, iv. tab. 116. 



Linn. Trans, viii. p. 99. 



Dorset Catal. p. 38, tab. 10, fig. 8. 



Dillwyn, Descript. Catal. p. 266. 

 Pecten lineatus. Da Costa, p. 147, tab. 10, fig. 8. 



Montagu, Test. Brit. p. 147. 



Pennant, Brit. Zool. iv. p. 222. 



Turton, British Fauna, p. 161. 

 Lister, Conch, tab. 170, fig. 7. 

 Mus. nost. Common to most sandy coasts. 



2e 



