CONG HYLI A— D/THYE J. 36. 147 



Shell nearly an inch long, and rather more broad, with broad flat 

 ribs of unequal size, the edges of which generally project a little 

 beyond the anterior margin, forming a double row of tubercles ; color 

 whitish or fulvous, with broad or narrow longitudinal rays or fine 

 lines of white red yellow or purple: beaks central, with the areola 

 broad heart-shaped. 



If Trig ono-cor data. 

 Triangular heart-shaped. 



Venus testa trigono cordatd, lamelUs transversis remotis crehro can- Dysera. 



cellatis, areola cordatd sulcis curvis. 

 Shell triangular heart-shaped, with remote transverse plates which 

 are closely cancellated, the areola heart-shaped with curved 

 grooves. 



Tab. nost. 9, fig. 4. 

 Venus Dysera. Linn. Syst. Nat. p. 1130. 

 Gmelin. Syst. p. 3268. 

 Turton, Linn. Syst. iv. p. 219. 

 Chemnitz, vi. p. 294, tab. 28, fig. 287-290. 

 Montagu, Test. Brit. Suppl. p. 42. 

 Pennant, Brit. Zool. iv. p. 204. 

 Turton, Conch. Diet. p. 237. 

 Venus cingenda. Dillwyn, Descript. Catal. p. 161. 

 Pectunculus maculatus. Lister, Conch, tab. 277, and 278. 

 Mus. nost. From the shores round Guernsea. 



Shell rather more than an inch in diameter, convex, grey or 

 ivory white, variously marked with brown or chesnut blotches, 



