G01<iGRYUA—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. 11, fig. 20-23 

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



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

 Venus Montagui. Dillwyn, 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, mark- 

 ed with rather remote, rounded rib-like striaa, white or covered with 

 a yellowish brown skin : beaks prominent, giving that jjart a rather 

 triangular outline ; inside white, with the margin flat thin and en- 

 tire. 



It something resembles the very young of Cyprina Islandica ; but 

 in that shell the beaks are not so prominent, and the transverse 

 strine are rather laminar and not rounded, and it wants the impres- 

 sion under the beaks, which in the present species is narrow but 

 very distinct. 



Cyprina testa orbiculo-cordatd suhcompressd, costis transversis latis """I'm-- 



IfBvihus, dentibus duobus. 



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



transverse ribs, and two teeth. 

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



Linn. Trans viii. p. 81. 

 Turton, British Fauna, p. 158, 

 T 



