QO'^GRYLIA—DITHYRA. 36. 151 



Dillwyn, Descript. Catal. p. 171. 



Tarton, Couch. Diet. 239. 

 Cardium striatum. Walker, jj. 23, fig. 82. 



Pectunculus parvus, albidus. Lister, Conch, tab. 311- fig. 147. 

 Mus. nost. Western and Irish coasts. 



Shell about half an inch long, and a little more in breadth, opake, 

 of a pale brown color with sometimes a few darker bands, with nu- 

 merous strong longitudinal ribs which are clothed with scale-like 

 prominences disposed transversely; inside glossy-white or flesh color, 

 with sometimes a purple blotch in the middle : beaks nearly central, 

 prominent, a little curved, with a faint heart-shaped imjiression un- 

 der them. 



This species is very singular in its genus, in having no distinct 

 area or slope on the anterior margin ; and so much resembles a Car- 

 dium, that we have sometimes seen it in cabinets marked as the 

 Cardium exiguum. 



** Margine interno integerrimo. 13-21 



With the inner margin very entire. 



f ovatcs. 



oval. 



Venus testa ovatd tenui semipellucidd, transversim rugosd, strus longi- substriata. 

 tudinalibus obsoletis undatis. 



Shell oval thin semitransparent, with transverse wrinkles and obs- 

 cure undulate longitudinal striae. 



