102 TESTACEOUS MOLLUSCA. 



C. Lactea. Lam. 47. Very small, rounded, oblique, pellucid, 

 whitish stained with purple at the beaks. J . 



C. Exoleta.* Lam. 48. -Venus E, Lin. 1134. — JD. p. 195. 

 W. t. 8./". 83.— Don. t. 42. f. \.—E.t. 279./. 5.— Bl. t. 74. f. 2. 

 — Ch.f. 404.— B. t. 5.f. 9 —List. 291. /. 127. $ t. 292. /. 128. 

 Orbicular, sub-equilateral and depressed, whitish with more or less 

 distinct rufous spots stains or rays, and sharply striated trans- 

 versely ; lunule heart-shaped, sunken, and sub-lamellar : ligament 

 concealed. Diam. If. — Mediterranean and Atlantic. — (A coarser 

 shell than C. Lincta.) 



C. Lincta.* Lam. 49. — Venus Lupinus. Lin. ed. 10. p. 689. 

 • — V. Exoleta Junior. L>. p. 196. — C. Sinuata. Turt. B. 

 t. 10./. 10.— List. t. 289. / 125. # t. 290. /. 126. Sub-orbicular, 

 oblique, inequilateral, the anterior side oblique less rounded and 

 larger than the posterior, glossy white, most elegantly and closely 

 striated transversely ; beaks prominent : the ligament concealed. 

 Diam . 1 J. — England, fyc. 



C Concentrica. Lam. 50. — Venus C. Omel. 3286. — D. 

 p. 196— List. t. 288./. 124.— Ch.f. 392.— E.t. 279. / 2.— W. 

 t. 8. /. 84. Orbicular, rather depressed, white, glossy, with 

 crowded equal concentric strise : lunule heart-shaped smooth and 

 excavated; cardinal cleft lanceolate. Diam. 2\. — W. Lndies. — 

 Flatter, but not unlike Exoleta. 



C. Prostrata. Lam. 51. — Venus P. Lin. 1133. — D.p. 192. 

 — B. t.b.f Q.— Ch.f. 298.— E. t. 277. / 1 — W. t. 8./ 77. 

 Orbicular, depressed, whitish or fulvous, with transverse strise, which 

 become more elevated and membranaceous at the extremities ; edge 

 of the anterior slope dentated : lunule sunken and heart-shaped. 

 Diam. If — Lndian Ocean. 1 



C. Umbonella. Lam. 55. Heart-shaped, tumid, inequilateral, 

 purplish near the beaks, whitish towards the margin, anterior side 

 smooth, posterior transversely grooved: umbones tumid and tessel- 

 lated ; lunule roundish, heart-shaped, and excavated : within white 

 with a violet spot on the anterior side. 3. — Red Sea? 



C. Scripta. Lam. 57.— Venus S. Lin. 1135. -B. p. 201.— 

 Ch.f. 420. to 425.— E. t. 274. /. \.—W. t. 8./ 97. Lenticu- 

 lar, flat, with the slopes truncated and forming a rectangle at the 

 umbo, transversely grooved and compressed at the beaks ; variable 

 in colouring, usually liver-brown, with white markings, or white with 

 reddish brown or liver- colour spots rays bands or zig-zag stripes ; 

 depressions brown, linear; ligament visible — Variety. (Unda- 

 tina. Lam. 56.) Smaller, not quite so flat, the ligament con- 



1 "C. Interrupta. Lam. 51. — Tigerina. 52. and Punctata. 



53. belong to Lucina." Deshayes. 



