158 COISCHYLIA-DITHYRA. 36. 



is fan evident angle at the anterior side, and the color is transpa- 

 rent horny, with some few scattered longitudinal marks. 



From Venus virginea it differs, in having obscure longitudinal 

 lines, ill the transverse striae not becoming broarder at the anterior 

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



decussata. Vevus testd ovato-rhoinbed, strils decussatis antich tuberculosis, 

 areola obsoletd, dentibus duobus Jissis. 

 Shell rhombic-oval, with decussate striae which become tubercular 

 at the anterior end, the areola obscure, and two of the teeth 

 cloven. 



Tab. nost. 8, fig. 10. 

 Venus decussata. Linn. Syst. Nat. p. 1 135. 

 Gmeliri, Syst. p. 3294. 

 Turton, Linn. Syst, iv. p. 24l. 

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

 Donovan, Bi'itish Shells, ii. tab 07- 

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

 Montagu, Test. Brit. p. 124. 

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

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

 Turton, British Fauna, p. 159. 

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

 Dillwyn, Descript. Catal. p. 205. 

 Turton, Conch. Diet. p. 244. 

 Cuneus reticulatus. Da Costa, y>. 202, tab. 14, fig. 4. 

 Ghamafusca. Lister, Conch, tab. 423, fi<;-. 271. 

 3Ius. nost. On all gravelly coasts. 



