140 TESTACEOUS MOLLUSCA. 
C. Susrucosum. Sow. Jun. Z. P. 1840.—C. I. f. 34. 
§'71. Thick, oval, ventricose (by age subacuminated anteriorly,) 
with thirty-three ribs of which the twenty-five posterior are 
rounded and crenulated, the extreme anterior smooth and scarcely 
elevated: epidermis brown.—Variety A. White with purple 
spots.—Variety B. White but yellow posteriorly. 22. .253,.— 
Ceylon. 
C. AtteRNATUM. Sow. Jun. Z P. 1840.—C. I. f. 64. 
Obliquely oval, compressed, subexpanded anteriorly, white with 
bands of yellow or yellowish brown spots under a brown epidermis : 
with thirty-two ribs, the posterior crenulated and subangulated, 
the - succeeding anterior ones angulated but smooth posteriorly, 
the extreme anterior muricated, the interstices convex and grooved 
on each side. 23..22.— Philippines. 
C. Procerum. Sow. Z. P. 1833.—Reeve. t. 77. f. 23.—C. 
I. f. 23. Ovate, the dorsal edge somewhat acuminated, pale 
with brown spots, posteriorly rounded, anteriorly subangulated ; 
with twenty-five radiating ribs of which the four posterior ones are 
rather indistinct, the rest prominent, anteriorly angulated and 
somewhat wrinkled, the central ribs flattened and obtusely angulated 
on each side, the anterior ones posteriorly angulated, the interstices 
flattened : anterior side grinning, the marginal teeth strong; epi- 
dermis brown. 3-25..3-35. 
C. PanaMENSE. Sow. Z. P. 1833.—C. I. f. 21.—Reeve. t. 
76. f. 21.—Beechey. Zool. t. 42. f. 7. Oboval, posteriorly 
rounded, anteriorly subangulated, grinning; the posterior and 
central radiating ribs large and broad, at first angulated and finally 
rounded, the anterior ones narrower and posteriorly crenated. 
1-9... 14.—Panama. 
C. Exatum. Sow. Z. P. 1833.—Reeve. t. 83. f.3.—C. I. 
f. 3. Oval, oblique, smooth, very ventricose, yellow; with 
numerous radiating grooves, of which the central except the an- 
terior are indistinct ; the side areas are smooth and their margins 
toothless: the ventral margin toothed: epidermis thin. 43..4.— 
California. 
C. Arrenvatum. Sow. Jun. Z. P. 1840. Smooth, wedge- 
shaped compressed, obliquely elongated, anteriorly somewhat flat- 
tened, covered with obscure strie, toothed at the margin; yellow 
with red spots which are stronger anteriorly ; white within. 
23.,14.—Ceylon.—ligured in Wood. G. C. t. 54. f. 2, as 
Biradiatum. 
C. Muxttireunctatum. Sow. Z. P. 1833.—Reeve. t. 75. 
f. 14.—C. I. f. 14. Oval, oblique, rather depressed, smooth, 
polished, pinkish fulvous with numerous darker spots and dots, 
and very close radiating strie; anterior dorsal margin sub- 
angulated. 13..1,3,— China. 
