CONCHYLIA— D/TJ^Fi?^. 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 longi- 

 tudinal rays or fine lines of white red yellow or purple: beaks 

 nearly central, with the areola broad heart-shaped. 



It Trigono-cordatce. 

 Triangular heart-shaped. 



Venus testa trigono-cordatd, lamellis transversis remotis crebrd p^, 

 cancellatis, areola cordatd sulcis curvis. 8. 



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, Liim. Syst. iv. p. 219. 

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

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

 PennuJit, Brit Zool. iv. p. 204. 

 Turton, Conch. Diet. p. 237. 

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

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

 Mtis. nost. From the shores round Guernsea. 



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

 ivory while, variously marked with brown or chesnut blotches, 



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