CONCHYLU— DITl/FiiJ. 28. 113 



Wood, Conch, p. 187. 

 Dillwyn, Descript. Catal. p. 99. 

 Tvrton, 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 im- 

 pression under them ; inside white, polished round the area of 

 the margin, where it is slightly striate longitudinally: in one 

 valve a single plain tooth, closing between two plain ones in 

 the other. 



LuciNA testa subohliqud incBquilaterali, striis Iransversis regu- Leucoma. 



laribus longitudinal ih usque 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 cur- 

 vature 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 



