34 
C. Guineensis. Lam.—Turt. B. p. 161.—F. p. 
445,—Venus G. Mont. Sup. p. 48. & 168.—Pen. 4. 
p. 207.—D. p. 169.—Dor. Cat. p. 35.—Turt. D. 
p. 237.—Ch. f. 311,2.—Obliquely heart-shaped, with 
numerous close-set sharp transverse subimbricated la- 
melle, 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%...12. Scotland and Weymouth. 
C. Exoreta. Lam. 48.—Bl. t. 74. f. 2.—Turt. B: 
t.8. f. 7. p. 162.—F. p. 445.—Venus E. Lin. 1134. 
—Ch. f.404.—List. t. 291. f. 127. and t. 292. f. 128. 
—Pen. 4. p. 209. t. 57. f.3.— Don. 2. t. 42. f. 1.— 
Mont. p. 116.—Lin. T. 6. ¢. 17. f.9, 10. & 8. p. 87. 
t.3.f.1—Dor Caé. p. 35.#.8.f.5.—D. p. [95.— 
Turt. D. p..241—Da Cost. t. 12. f. 5—E. t. 279.7. 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 strie; Junule heart-shaped, sunken and sub- 
lamellar; inside white. 2. Sandy bays. 
C. Lincta. Lam. 49.—F. p. 445.—VeEnus Sin- 
vATA. Gmel. 3285.—Turt. C: D. p. 242.—List.. t. 
289. f. 125. § 290. f. 126.—Dor. Cat. p. 35. t. 1, 
