148 co^ghylia—dithyra. m. 



with about twelve remote and somewhat undulate laminar ridges, 

 and close-set raised rib-like-striae beteen them, and which longi- 

 tudinal striae are themselves crossed by fine transverse lines, especi- 

 ally towards the beaks, where it slopes on the anterior side in a ra- 

 ther projecting curved line : the area is equally deep on both sides, 

 and with the areola of a chesnut color. 



It has something the outline of the Venus cancellata ; but the 

 ridges are more remote and less numerous ; there is no angularity on 

 the anterior side, but a regular slope ; and it may be distinguished 

 from that shell and the Venus laminosa, by the regular rib-like 

 semicircular striae on the areola, which is heart-shaped. 



laminosa. Venus testd tfigono-cordatd, autice acuminato-productd, laminis mem- 

 branaceis confertis crebro cancellatis, areola striata. 

 Shell triangular heart-shaped, produced and pointed at the anterior 

 end, with crowded transverse membranacous plates, the interstices 

 of which are closely striate longitudinally, and the areola striate. 



Tab. nost. 10, fig. 4. 

 Laskey, Wern. Soc. i. p. 384, tab. 8, fig. 16. 

 Montagu, Test. Brit. p. 38. 

 Pennant, Brit. Zool. iv. p. 202. 

 Turton, Conch. Diet. p. 233. 

 Mus. nost. Scotch, Irish, and Devonshire coasts. 



Shell in size and outline much resembling the Venus Gallina, 

 but the transverse striae are laminar thin and more remote, and 



