TRIBE CARDIACEA. 135 



C. ExiGUUM.* Lam. 35.— Gmel 32551— D. p. l\4.— List, 

 t. 317. /. 154.— Turt. B.p. 186.— TF. t. 5. f. Q.— Mont. p. 82. 

 — C. Pygm^um. Don. t. 32. _/. 3. Very small, sub -triangular, 

 the posterior side the shorter narrower and obliquely rounded, the 

 anterior extremity obhquely angulated ; pale tawny white, with 

 from twenty to twenty-two ribs which are surmounted by short 

 and somewhat arched tubercles. Diain,. f. — England. 



C. MiNUTUM. Lam. 36. Very small, rhombic heart-shaped, 

 pellucid white, with twenty rounded and transversely wrinkled ribs. 

 I-. — New Holland. 



C. RosEUM. Lam. 37. Very small, rounded heart-shaped, 

 thin, pink, with numerous rounded transversely striated un- 

 armed ribs. 1. — Cherbourg. 



C. SiNENSE. Sow. Jan. Z. P. 1840.— C. /. /. 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. 

 \^..\^.— 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. Lfiani. 1 J^. 

 — Xipixapi. 



C. Striatulum. Sow. Jun. Z. P. 1840.— C J. /. 16. ^' 45. 

 — Reeve, t. 86. jT. 16. Thin, rounded, anteriorly subrostrated and 

 with most minute radiating strise, pale fulvous with pink striped 

 bands (becoming obsolete by age) : inside white, rayed with two 

 red bands ; the anterior strise denticulated : epidermis brown. 

 ■^ff. .\.—N. Zealand, Sj-c. 



C. AusTRALE. Sow. Jun. Z. P. 1840.— C. I.f. \2.— Reeve, 

 t. 85. J'. 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. 1j''q..1^. — Aus- 

 tralia and China. 



C. CuMiNGii. 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. !• •^. 



C. AsPERSuM. Sow. Z. P. \833.—B.ecve. t. 85./. 15.— C I, 

 f. 15. Transversely oval, subequilateral, anteriorly gaping, pale, 

 marbled with reddish, serrated : with numerous radiating ribs, of 



