CONCHYLIA— D/THFE^. 28. 113 



l^ood, Conch, p. 187. 

 Dillwyn, Descript. Catal. p. 99. 

 Turton, Conch. Diet. p. 176. 

 Mus. nost. Torbay and the British Channel. 



Shell three quarters of an inch in diameter, thin, rather flat, 

 white or yellowish, irregularly striate transversely : beaks central, 

 prominent, pointed and curved, with a small heart-shaped impres- 

 sion under them ; inside white, polished round the area of the mar- 

 gin, where it is slightly striate longitudinally : in one valve a single 

 plain tooth, closing between two plain ones in the other. 



LuciNA testa suhohliqud ineBquilaterali, striis transversis regularibus Leucoma. 



longitudinalibusque minimis. 

 Shell rather oblique and inequilateral, with regular transverse striae 



and minute longitudinal ones. 



Tab nost. 7, fig. 8. 

 Mus. nost. Torbay, British Channel, and Guernsea. 



Shell five eighths of an inch in diameter, convex, orbicular but 

 a little produced and angular on the anterior side, and generally a 

 little flexuous under the beaks on the other side, of a chalky white 

 color, and marked with regular crowded transverse raised striae and 

 deeper wrinkles ; these are crossed by extremely fine and close-set 

 longitudinal lines : beaks prominent, with a curvature under them : 

 inside and hinge as in Lucina lactea. 



The longitudinal striae are not always very evident, especially in 

 the younger shells ; but its greater convexity and regular transverse 

 striae at all times distinguish it. 



Q 



