TRIBE CARDIACEA, 145 
like tubercules, the interstices much broader than the ribs, the 
lunule small and excavated.—Senegal. (Reeve. Ic. t. 6. f. 23. 
ood.) 
‘ C.Turaipa. 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. 13..2.—Indian 
Ocean. 
C. Intermepia. Lam.6. 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. ¢. 12. 7.15. Isit a recent shell at all ?) 
C. Trapvezia. Lam. 9.—CuamaT. Lin. 1138.—D. p. 216.— 
E.. t. 234. f. 7.—-Ch. f. 2005, 6.—W.t. 9. f. 8.  Trapeziform, 
with about nineteen or twenty crenulated ribs and the margin 
plaited, rather tumid, reddish and transparent: paler within. }..%. 
—Norway. Mediterranean ? 
C. Bicotor. Lam. 10.—Reeve. Ic. t. 6. f. 29.—CHama ANTI- 
quata. Lin.—H. t. 233. f. 2, 3.—Ch. f. 490, 1.— W. t. 9. f. 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. (Ch. f. 488, 9.) 12.—Africa. 
C. Depressa. Lam. 11. Oblique, oval, depressed, white 
somewhat ferruginous, with crowded and moderately convex ribs 
which become indistinct anteriorly. 12.—Looks like a fossil. 
C.Boreauis. Conr. Am. M. C.p. 39. t. 8. f. 1.—Beechey. 
Zool. t. 44. f. 1.—Gould. Mas. f. 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. f. 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 interstices narrow ; decussated near the umbones which are in- 
volute : ligament in a deep depression of the dorsal edge ; inner 
margin irregularly undulated. 14.— Acapulco. 
“1C, Squamosa. Lam. 4. is alarge Trapezia.””— Desh. 
L 
