L. Rotunpata. Turt- B. p. 115. t. 7. f. 3.—TEL- 
ina R. Mont. p. 71. ¢. 2. f. 3.—Pen. 4. p. 182.— 
Lin. T. 8. p. 56.— Dor. Cat. p. 30. t. 5. f. 8.—Wood. 
G. C. p. 187.—D. p. 99.—Turt. D. p. 176.— 
PsamMosnia R. F. p. 458.—Orbicular, convex and 
nearly smooth, a little undulated in the circumference, 
yellowish white or pale horn color and transparent ; 
beaks not quite central, rather prominent ; inside white, 
but not glossy, except the area round the margin; hinge 
with two teeth in each valve, one cloven, the other di- 
verging, lateral cavity narrow and nearly straight. 1. 
W. Coasts and Ireland. 
L. Unpata. Turt. B. p. 115.—Lam. 13.—VeEnus 
U. Pen. 4. p. 209. ¢. 58. f. 3.—Lin. T. 6. p. 169. ¢. 
17. f. 17,8.—Moné. p. 117.—Don. t. 121.—Lin. T. 
8. p. 86.—D. p. 197.—Turt. C. D. p. 241. f. 54.— 
Orbicular, convex, with slight concentric strize, very thin 
and brittle, dull yellowish white, slightly undulated at 
its margin; beaks subcentral, no lunule; inside glossy 
yellowish white: hinge with three teeth (one bifid) in 
one valve, two in the other. 1. Common on sandy 
shores. 
L. Rapura. Lam. 5.—Turt. B. p. \16.—F. p. 441. 
TeLuina R. Mont. p. 68. ¢. 2. f. 1,2.—Lin. T. 8. p. 
D 
