TRIBE CARDIACEA. 135 
_ C. Exreuum.* Lam. 35.—Gmel. 3255’—D. p. 114.—List. 
t. 317. f. 154.—Turt. B.p. 186.—W. t. 5. f. 6.—Mont. p. 82. 
—C. Pvemazum. Don. t. 32. f3. Very small, sub-triangular, 
the posterior side the shorter narrower and obliquely rounded, the 
anterior extremity obliquely angulated ; pale tawny white, with 
from twenty to twenty-two ribs which are surmounted by short 
and somewhat arched tubercles. Diam. 2.—Hngland. 
C. Minutum. Lam. 36. Very small, rhombic heart-shaped, 
pellucid white, with twenty rounded and transversely wrinkled ribs. 
4.—New Holland. 
C. Rosrum. Lam. 37. Very small, rounded heart-shaped, 
thin, pink, with numerous rounded transversely striated un- 
armed ribs. 1.—Cherbourg. 
C. Stnense. Sow. Jun. Z. P. 1840.—C. I. f. 35. Rounded, 
anteriorly subrostrated, slightly grinning, somewhat expanded at 
the margin, covered with minute granules (especially posteriorly), 
pale fulvous ; with twenty-three strong rounded ribs of which the 
eight anterior are narrower, fimbriated, and anteriorly sub-angu- 
lated: dorsal edge inflated, inner ventral very strongly toothed. 
12,.143.—China. 
C. Laticostatum. Sow. Z. P. 1833.—C. I. f. 30. Rounded, 
subventricose, anteriorly subangulated, grinning, pale with brown 
spots, and radiating ribs, of which the anterior ones are angulated, 
the rest broad and rounded ; the interstices narrow. Diam. 155. 
— Xipixapi. 
C. Srriatutum. Sow. Jun. Z. P. 1840.—C. I. f. 16. § 45. 
— Reeve. t. 86. f. 16. Thin, rounded, anteriorly subrostrated and 
with most minute radiating striz, pale fulvous with pink striped 
bands (becoming obsolete by age): inside white, rayed with two 
red bands ; the anterior striz denticulated : epidermis brown. 
9,.-1.--N. Zealand, ge. 
C. Austrate. Sow. Jun. Z. P. 1840.—C. I. f. 12.—Reeve. 
t. 85. f. 12. Obliquely ovate, thin, white, with spots (particularly 
at the smooth umbones) of reddish purple and brown, the sides 
with purple bands; sides and margins delicately grooved : a scar 
running from the apex to the anterior margin. 1,9; ..14.—Aus- 
tralia and China. 
C.Cuminent. Brod. Z. P. 1833.—C. I. f. 5.— Reeve. t. 84. 
f. 5. Equivalve tumid, fragile, rosy, diaphanous, elegantly can- 
cellated, posteriorly wrinkled, the valves anteriorly gaping; a 
whitish posterior crest extending from the umbo to the ventral 
margin. 1..4. 
C. Aspersum. Sow. Z. P. 1833.—Reeve. t. 85. f. 15.—C. I. 
f. 15. Transversely oval, subequilateral, anteriorly gaping, pale, 
marbled with reddish, serrated : with numerous radiating ribs, of 
