1 14 CONCHYLIA— D/THYl?^. 28. 



In some specimens also we have remarked a small remote tubercle 

 on each side the hinge, like obscure lateral teeth. 



** Fovea intern rectiusculd. 3-6. 

 The internal cavity nearly straight. 



alba. LuciNA testa orbiculari convexd, striis transvcrsis regularibus remotius- 

 ^- culis, valvd altera bidentatd, alterd unidentatd. 



Shell orbicular convex, with rather remote regular transverse striiv, 

 hinge with two teeth in one valve and one in the other. 



Tab nost. 7, fig. 6 and 7. 

 Mus. nost. British Channel, and shores about Guernsea. 



Shell about three eighths of an inch in diameter; and differs 

 from the Lucina Leucoma, in being of a more regularly rounded 

 form, of a more glossy white, with the striae rather distant and 

 about half the size of the interstices between them, without the 

 deeper ridges or the least appearance of longitudinal lines, and the 

 internal cardinal cavity is narrow and nearly in a straight direction 



rotundata. Ltjcina testd convexd loBviusculd , margine subundato, valvis bidentatis. 

 Shell convex and nearly smooth, a little undulate in the circum- 

 ference, with two teeth in each valve. 



Tab. nost. 7, fig. 3. 

 Tellina rotundata. Montagu, Test. Brit. p. 71, tab. 2, fig. 3. 

 Pennant, Brit. Zool. iv. p. 182. 

 Linn. Trans, viii. p. 56. 

 Turton, British Fauna, p. 151. 



4. 



