CO^CHYUX—DITHYRA. 35. 137 



Shell roundish triangular a little compressed, with rather remote 

 transverse rib-like striae, the hinder impression elongated, and 

 two teeth. 



Tab.nost. U, fig. 20-23. 

 Venus compressa. Montagu, Suppl. p. 43, tab. 26, fig. 1. 



Pennant, Brit. Zool. iv. p. 209. 

 "Venus Montagui. Dilluoyn, Descript. Catal. p. 167. 

 Venus Montacuti. Turton, Conch. Diet. p. 243. 

 Mus. nost. From the Dunbar coast. 



Shell about half an inch in diameter, strong, thick, flattish, 

 marked with rather remote, rounded rib-like striae, white or 

 covered with a yellowish brown skin : beaks prominent, giving 

 that part a rather triangular outline ; inside white, with the 

 margin flat thin and entire. 



It something resembles the very young of Cyprina Islandica ; 

 but in that shell the beaks are not so prominent, and the trans- 

 verse striae are rather laminar and not rounded, and it wants the 

 impression under the beaks, which in the present species is nar- 

 row but very distinct. 



Cyprina testa orbicnlo-cordatd suhcompressd, costis trans- luinima. 



versis latis loivibus, dentibus dtiobus. 

 Shell round heart-shaped a little compressed, with broad smooth 



transverse ribs, and two teeth. 

 Venus minima. Montagu, p. 121, fab. 3, fig. 3. 

 Linn. Trans, viii. p. 81. 

 Turton, British Fauna, p. 138. 



T 



