158 CO^GRYLl A— DITHYR A. 36. 



is an evident angle at the anterior side, and the color is transparent 

 horny, with some few scattered longitudinal marks. 



From Venus virginea it differs, in having obscure longitudinal 

 lines, in the transverse striae not becoming broader at the anterior 

 end, and in having only one of the teeth cloven. 



decussata. Venus testd ovato-rhomhed, strils decussatis antici tuberculosis, areola 

 obsoletd, dentibus duobus Jissis. 

 Shell rhombic-oval, with decussa:e striae which become tubercular at 

 the anterior end, the areola obscure, and two of the teeth cloven. 



Tab. nost.8,fig. 10. 

 Venus decussata. Ldnn. Syst. Nat. p. 1135. 



Gmelin, Syst. p. 3294. 



Turton, Linn. Syst. iv. p. 241. 



Pennant, p. 210, tab. 60, middle fig. 



Donovan British Shells, ii. tab. 67- 



lAnn. Trans, vi. p. 168. tab. 17, fig. 11. 12. 



Montagu, Test. Brit. p. 124. 



Chemnitz, vi. p. 58, tab. 43, fig. 455, 456. 



Ldnn. Trans, viii. p. 88, tab. 2, fig. 6. 



Turton, British Fauna, p. 159. 



Dorset Catal. p. 36, tab. 6. fig. 4. 



Dillwyn, Descript. Catal. p. 205. 



Turton, Conch. Diet. p. 244. 

 Cuneus reticulatus. Da Costa, p. 202, tab. 14, fig. 4. 

 Chama fusca. Lister, Conch, tab. 423, fig. 271. 



Mus. nost. On all gravelly coasts. 



