CO^CHYUX—DITHYKA. 40. 



Dillwyn, Descript. Catal. p. 244. 



Tnrton, Conch. Diet. p. 8. 



Chemnitz, vii. p. 241, tab. 58, fig. 474. 

 Glycyineris argentea. Da Cosla, p. 170, tab. 15, fig. 6. r. liand. 

 Mtis. nost. On most coasts. 



Shell half an inch long, and not quite so broad, produced on 

 one side, covered with a smooth blackish or dark olive-green skin, 

 with often some yellowish rays and very minute striae, beaks near 

 one end, inclining to the shorter side, with an oval impression 

 under them: inside silvery white: teeth about twenty on the elon- 

 gated side, and half the number on the other. 



=^* Margine interno integerrimo. 2-4. 

 The inner margin very entire. 



177 



NucuLA testa obliqud cordatd rottmdatd l^viusculd. 

 Shell obliquely heart-shaped roundish and nearly smooth, 

 Area tenuis. Montagu, Suppl. p. 56, tab. 29, fig. 1. 



Pennant, Brit. Zool. iv. p. 218. 

 Dillwyn, Descript. Catal. p. 246. 



Turton, Conch. Diet. p. 11. 

 On the Scotch coasts. 



tenuis.. 



2. 



Shell a quarter of an inch long, and rather more in breadth, 

 white or covered with a thin olive skin, produced and rounded 

 at one end ; inside white, a little perlaccous, with the margin 

 plain. 



2a • 



