TRIBE CARDIACEA. 14o 



like tubercules, the interstices much broader than the ribs, the 

 lunule small and excavated. — Senegal. (Reeve. Ic. t. 6. f. 23. 

 good.) 



C. TuRGiDA. Lam. 3. Obliquely heart-shaped, broader than long, 

 tumid, posterior side very short and obtuse, -with from eighteen to 

 twenty longitudinal sub-angulated crenulated ribs : anterior slope 

 broad and the posterior depression sunken and rounded heart- 

 shaped. Variety/, smaller with the anterior depression more elevated 

 and the crenations of the ribs more numerous. If ..2. — Indian 

 Ocean. ^ 



C. Intermedia. Lavi.G. Obliquely heart-shaped, transverse, 

 the posterior side very short ; transparent, with separated rounded 

 and crenulated ribs the posterior ones grooved at the sides. — New 

 Holland. (Exactly resembles the fossil represented in Brocchi 

 Conch, t. 12./. 15. Isit a recent shell at all ?) 



C. Trapezia. Zam. 9.— Chama T. Zm. 1 138.— Z).p. 216. — 

 E. t. 234./. I.— Ch.f. 2005, ^.—W. t. 9. / 8. Trapeziform, 

 with about nineteen or twenty crenulated ribs and the margin 

 plaited, rather tumid, reddish and transparent : paler within. :^..|^. 

 — Noi'wai/. Mediterraneayi ? 



C. BicoLOR. Lam. 10. — Reeve. Tc. t. C. f. 29 — ChamaAnti- 

 QUATA. Lin.—E.t. 233./. 2, 3.— Ch.f. 490, l.— W. t. 9:/ 4. 

 Obliquely heart-shaped, attenuated produced and subangulated ante- 

 riorly, white spotted with rufous on the angular ribs which have their 

 upper surface flattened and most of them smooth, but the posterior 

 ones thickly crenulated, inside uniform whitish. Variety, smaller, not 

 produced but crenated also posteriorly. {Cli.f. 488, 9.) If. — Africa. 



C. Depressa. Lam. 11. Oblique, oval, depressed, white 

 somewhat ferruginous, with crowded and moderately convex ribs 

 which become indistinct anteriorly. \f.— Looks like afoml. 



C. Borealis. Conr. Am. M. C. p. 39. t. 8. / 1. — Beecliey. 

 Zool. t. U.f. l.— Gould. Mas./. 59. p. 94. Rounded, obliquely 

 heart-shaped, thick, strong, inequilateral, beaks prominent and 

 recurved ; with about twenty rounded radiating ribs which are 

 broader than their rough interstices ; epidermis rusty brown ; 

 lunule small, deep, rhomboidal ; margin strongly crenated ; inside 

 white ; hinge with two teeth in each valve. — N. America. 



C. Crassa Sow. in Beechey. Zool. p. 152. t. 42./. 4. Obovate, 

 subquadrate, very turgid, thick, roughish, white with a brown 

 cuticle ; posteriorly very short scarcely projecting beyond the 

 umbones ; with fifteen or sixteen broad rounded radiating ridges, 

 the intei'stices narrow ; decussated near the umboues which are in- 

 volute : ligament in a deep depression of the dorsal edge ; inner 

 margin irregularly undulated. \\. — Acapulco. 



' C. Squamosa. Lam. 4. is a large Trapezia." — Desk. 



L 



