130 TESTACEOUS MOLLUSCA. 
reddish at the beaks, and tinged with rose colour on the anterior 
side ; aperture of the anterior side patulous : margins deeply 
serrated. 2.—Indian Ocean. 
C. Rincens. Chem. f. 170.—Gmel. 3254.—D. p. 119.— 
Lam. 3.—Wood. G. C. t. 53. f. 1, 2.—W. t. 5. f. 18.—Knorr. 
4.t.14. f. 3.—E#. t. 296. f. 3. Roundish, ventricose, whitish 
tinged with rose colour on the anterior side where the margin is 
deeply serrated and gaping, with about twenty-six longitudinal ribs 
which are unarmed, and the anterior ones somewhat keeled and 
irregularly grooved on one side. Diam. 1.—Africa. 
C. Astaticum. Lam. 4.—C. Lima. Gfimel. 3253.—W. t. 5. 
f. 32.—D. p. 110.—Ch. f. 153, 4.—H. t. 293. f. 2. Heart- 
shaped, tumid, whitish or pale fulvous and the beaks tinged with 
red, with numerous small ribs which posteriorly are edged with 
short spines, anteriorly with recurved lamelle, which are furrowed 
on one side; margins serrated. 13..2.— Nicobar Isles. 
C. Tenuicostatum. Lam. 5.—Del. t. 11. f.6.—C. I. f. 19, 
36. Somewhat heart-shaped, whitish with the beaks rosy and 
smooth, with nearly fifty unarmed ribs which are obsoletely im- 
bricated anteriorly ; posterior depression indistinct, and the valves 
shutting quite close. 21.-—Timor and New Holland. 
C. Fimprratum. Lam. 6.—Wood. G. C. t.56. f. 5.—Beechey. 
Z.t. 42. f. 1.—W. t. 5. f. 39. Somewhat heart-shaped, whitish 
with the beaks rather violet, with thirty-six unarmed convex ribs, 
which are only lamelliferous at the apex, and not at all on the 
posterior side; the margin fringed with crested lamelle ; the pos- 
terior depression oval, a callosity under the beaks. 11.—Jndian 
Ocean? 
C. Brasttranum. Lam. 7.—C. I. f.60. Obliquely ovate, 
smooth, ash colour, partially painted with longitudinal rufous lines, 
and the anterior slope spotted with brown; within chesnut, ahd 
the margin toothed. 1.—Rio Janiero. 
C. ApertuM. Chem. f. 181, 2, 3.—Lam. 8.—Wood. G. C. t. 
56. f. 2.—W. t. 5. f. 35.—C. Vireineum. var. B. Gimel: 
3253.—V. Rucatum. D.p. 125.—H. t.296. f. 5. Somewhat 
heart-shaped, inequilateral, the anterior end being produced and 
gaping, pale fulvous, or whitish with the beaks tawny orange and 
smooth, with narrow distant acute longitudinal ribs which are 
flattened at the anterior extremity ; within stained anteriorly with 
rose colour. 13.— Jamaica. 
C. Papyraceum. Chem. f. 184.—C. I. f. 55, 6.—W. t. 5. 
J. 33.—G@mel. 3254.—D. p. 125. Somewhat heart-shaped, thin, 
brittle, pellucid, whitish, tinged with purplish red at the beaks, 
nearly equilateral, with obsolete longitudinal strie ; slightly 
gaping on the anterior side, posterior depression large and oval : 
within spotted with purplish brown. 13..13.—Japan. 
C. Butitatrum. Lam. 10.—Soren B. Lin. 1115.—D. p. 69. 
