TRIBE CARDIACEA. 141 
C. Evenense. Sow. Jun. Z. P. 1840.—C. I. f. 58. 
Thin, smooth, oval, subacuminated anteriorly, pale fulvous with 
brown and purple dots, the inside brown with red bands ; umbones 
not prominent, spotted with purple. $..2?.—W. Columbia.— 
Very like Brasilianum. 
C. Sussrriatum. Conr. Jour. A. N.S. Phil. 7. p. 228. 
t. 17. f. 2. Obliquely ovate, ventricose, thin, smooth, with the 
radiating strize obsolete except at the base of the umbonal slope, 
yellowish variegated with brown, umbo and middle of the disc 
tinged with blue: inside yellow varied with brownish purple, 
markings, the margin finely serrate. 3.—W. California.— Pos- 
sibly the young of another species. 
C.Mortonr. Conr. Jour. A. N.S. Phil. 6.t. 11. f. 5, 6, 7. 
—Gould. Mas. p. 91.—C. I. f. 53, 42 Subovate, oblique, 
subventricose, thin, destitute of ribs or radiating strize, white under 
a pale brown epidermis, darker towards the margin, and wrinkled 
at the ends : inside striated, yellow, the margin entire or obsoletely 
serrated and whitish, generally an oblong black or dark purple spot 
on the anterior side. 1 ..1.—United States. 
C. Fracite. Sow. Jun. Z. P.1840.—C. I. f.68. Rounded, 
thin, smooth, subequilateral, slightly inflated anteriorly, white 
lineated with brown under a fulvous epidermis; within white, and 
reddish at the margin; yellow at the umbones; margin slightly 
grooved. 1..1,4. 
C. Lyratum. Sow. Jun. Z. P. 1840.—C. I. f. 40. Ven- 
tricose, rounded subequilateral, pale fulvous under a purplish red 
epidermis, within golden yellow ; posteriorly decussated with plaits, 
the ribs numerous, the posterior very fine, the central stronger, 
the anterior distant and angulated. 1,1,.. 1415.—Philippines.— 
Closely resembling Eolicum, but without the smooth anterior area. 
* * Beaks carinated or provided with an angle ; posterior side 
often longer than the anterior. 
C. Unepo. Lin. 1123.—D. p. 119.—Lam. 39.—Ch. f. 168, 
9.—L. t. 295. f. 4.—Wood. G. C.t. 58. f. 3.—W.t. 5. f. 50. 
Somewhat heart-shaped, rounded, turgid, the anterior extremity 
forming an angle above and projecting; white, with numerous 
purplish red crescent-shaped elevated markings on the polished and 
rounded ribs: margin strongly serrated anteriorly. 2..13.—H. 
Indies. 
C. Mepvium. Jin. 1121.—D. p. 113.—Lam. 40.—W. t. 5. 
f. 5.—Ch. f. 162, 3, 4.—E. t. 296. f. 1—Wood. G. C. t. 50. 
jf. 3.—Somewhat heart-shaped, turgid, whitish clouded and spotted 
with rufous and brown, marked with strong longitudinal rounded 
ribs, which are separated by almost equally broad furrows and 
crossed by minute transverse strie ; the anterior side is somewhat 
