84 



C. GUINEENSIS. Lam. Turt. B. p. 161. F. p. 

 445. VENUS G. Mont. Sup. p. 48. fy 168. Pen. 4. 

 p t 207. D. 4>. 163. Dor. Cat. p. 35. Turt. D. 

 p. 237. Ck. f. 311,2. Obliquely heart-shaped, with 

 numerous close-set sharp transverse subimbricated la- 

 mellae, greyish white, with two or three purplish brown 

 longitudinal rays ; lunule cordiform ; inside white in- 

 clining to purple towards the margin ; both the slopes 

 purple. 1 !...!. Scotland and Weymouth. 



C. EXOLETA. Lam. 48. Bl. t. 74. f. 2. Turt. B: 

 t. 8./. 7. p. 162. P.p. 445. VENUS E. Lin. 1134. 

 CA./.404. List. t.29\.f. 127. and t. 292./. 128. 

 Pen. 4. p. 209. t. 57. f. 3. Don. 2. t. 42. / 1. 

 Mont. p. 116. Lin. T.6. t. 17./.9, 10. $-8. p. 87. 

 t. 3./. 1. Dor Cat. p. 35. t. S.f. 5.D. p. 195. 

 Turt. D. jp/241 Da Cost. t. 12. / 5 E. t. 279. f. 5. 

 Suborbicular, subequilateral, compressed, whitish or dull 

 reddish with broken red or purple rays, broad stripes 

 or fine lines and roughened by close-set transverse ca- 

 pillary striae; lunule heart-shaped, sunken and sub- 

 lamellar; inside white. 2. Sandy bays. 



C. LINCTA. Lam. 49. F. p. 445. VENUS SIN- 

 UATA. Gmel. 3285. Turt. C: D. p. 242. List., t. 

 289. /. 125. #-290. / 126. Dor. Cat. p. 35. t. 1, 



