102 TESTACEOUS MOLLUSCA. 



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

 whitish stained with purple at the beaks. ^. 



C. Exoleta.* ia?M. 48. -Venus E. im. 1134.— D. p. 195. 

 W. U 8. /: 83.— Z>o?i. f.42. f. \.—E. t. 27^. f. 5.—BL t. 74. f. 2. 

 — Cli.f. 404.— B. t. 5./. 9.— List. 291./. 127. ^' t. 292. f. 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 At lafitic. — {A coarser 

 ahell tlian C. Linda.) 



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

 — V. Exoleta Junior. D. p. 19G. — C. Sinuata. Turt. B. 

 t. 10./. \Q.—List. t. 289./. 12.5. ^' t. 290. f. 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. Ij. — England, fc. 



C CoNCENTRicA. Z,am,. 50. — Venus C. Gmel. 3286. — I). 

 p. 196— List. t. 288./. 124.— CA./. 392.— E.t. 279./. 2.-W. 

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

 crowded equal concentric striae : lunule heart-shaped smooth and 

 excavated ; cardinal cleft lanceolate. Diam. 2^. — W. Indies. — 

 Flatter, hut not unlike Exoleta. 



C. Prostrata. Lam.bl. — Venus P. Lin.\\33. — Z>.;;. 192. 

 —B. t. 5./ C}.— Ch.f. 29^.— E. t. 277. f. \.—W. t. 8./ 77. 

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

 become more elevated and membranaceous at the extremities ; edge 

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

 Diam. If — Indian Ocean. ^ 



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. — -D. p. 201. — 

 Ch.f. 420. to 425.— E. t. 274. /. 1.— 7F. 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." Deshai/es, 



