CONCHYLIA—DITHYRA. 36. 159 



Shell two inches long, and three broad, angularly truncate at the 

 anterior side which is tubercled, brown, grey, or yellow, with »trtea 

 darker rays or spots: inside glossy white or yellowish, purple about 

 the cartilage: beaks with the areola wanting or very obscure. 



Venus testa ovato-rkombed, striis decussatis minimis cmtici Pullastra. 



subasperis, areola obsolela, dente medio Jisso. 

 Shell rhombic-oval, with minute decussate striae which are a 



little rough at the anterior end, the areola obscure, and the 



middle tooth cloven. 



Venus Pullastra. Linn. Trans, vi. tab. 17,% 13, 14. 



Linn. Trans, viii. p. 88, tab. 2, fig. 7. 



Pennant, Brit. Zool. iv. p. 210. 



MoHta<rn, Test. Brit. iv. p. 125. 



Turton, British Fauna, p. 159. 



Dorset Catal. p. .36. tab. 1 . flg. 8. 



Turton, Conch. Diet. p. 244. 

 Venus Senegalensis. Dillwyn, Descript. Catal. p, 206. 

 Mus. nost. English and Irish coasts. 



'o' 



Shell resembling the last, but is more delicate, generally of an 

 ivory white with purple blotches, rarely grey with dark rays, and 

 the decussations are much finer. It is also generally of a more 

 oblong shape, and the young ones are not so angular. 



