73 



L. ROTUNDATA. Turt- B.p. 1 15. t. 7./. 3. TEL- 

 LINA R. Mont. p. 71. t 2. /. 3. Pew. 4.^. 182. 

 Lin. T. 8. ^. 56. Dor. Cat. p. 30. t. 5.f. .Wood. 

 G. C. p. 187. D. p. 99. Turt. D. p. 176. 

 PSAMMOBIA R. F. p. 438. 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. UNDATA. Turt. B.p. 115. Lam. 13. VENUS 

 U. Pen. 4.p. 209. t. 58. /. 3. Lin. T. 6. p. 169. t. 

 17. /. 17,8. Mont. p. 117. Don. t. 121. Lin. T. 

 S.p.SQ.D.p. 197. Turt. C. D.p. 241. /. 54. 

 Orbicular, convex, with slight concentric striae, 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. RABULA. Lam. 5. Turt. B.p. 116. P.p. 441. 

 TELLINA R. Mont. p. 68. f. 2./. 1,2. Lin. T. 8. p. 



