CO^GRYLIA—DITHYRA. 36. 159 



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

 anterior side which is tubercled, brown, grey, or yellow, with often 

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

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



Venus testa ovato- rhomhed, striis decussatis minimis anticS subasperis, 



areola obsoletd, dente medio fisso. 

 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 PuUastra. Linn. Trans, vi. tab. 17, fig. 13, 14. 

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

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

 Montagu, Test. Brit. p. 125. 

 Turton, British Fauna, p. 159. 

 Dorset Catal. p. 36, tab. 1, fig. 8. 

 Turton, Conch. Diet. 244. 

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

 Mus. nost. English and Irish coasts. 



^ 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 ob- 

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



