CARDIUM. Ill 



Inhabits the Asiatic Ocean. Linnceus. Coasts of Amboyna. 

 Rumphius. China and Tranquebar. Humphreys. Persian 

 Gulf, and coasts of Coromandel. Bruguiere. 



Shell generally about twenty three lines long, twenty broad, 

 and eleven high, and is remarkable for its elegant form, com- 

 pletely resembling a heart, and for the flatness of its valves ; 

 it is whitish, with transparent milky spots, and is sometimes, 

 though rarely, variegated with pale rose colour ; the ante- 

 rior side is convex near the hinge, and becomes flattish to- 

 wards the margin, and close beneath the umbones is a small 

 cordiform depression ; the valves are very thin, and have 

 their angulated keel spinous. 



humanum. 4. Shell heart-shaped ; valves com- 

 pressed and keeled, with the anterior side 

 convex ; umbones approximated. 



Cardium humanum. Chemnitz, vi. p. 153. t. 145 and 146. 



Wood's Conch, p. 245. f. 3 and 4. 

 Cardium Cardissa Var. £. Linneeus Mus. Lud. Ulr. p. 



484. Bruguiere Erie. Meth. p. 208 

 Cardium Cardissa. a. Born. Mus. p. 40. t. 2. f. 15 and 



16. 

 Cardium protrusum. Solander's MSS. Port/and Cat. p. 



178. lot 3825. Call. Cat. p. 49- No. 918. 

 Bonanni Rec. 2. f. 49- and Kirch, f. 48. Lister Conch, t. 



319- f- 156. Klein Ost. t. 10. f. 39- Knorr, vi. t. 1 1, f. 



1. Favanne, t. 51. f. E. 1. Enc. Meth. t. 294. f. 1. 

 Inhabits the Eastern Ocean. Lister. Coasts of China and 



Tranquebar. Humphreys. 

 Shell about sixteen lines long, fourteen broad, and rather more 

 than six high ; it differs from C. Cardissa in being smaller, 

 and proportionably broader in the keel which is at most 

 only very miuutely crenulated, and in the colour, which ge- 

 nerally consists of red spots disposed in a quincunx order on 

 a white ground. 



roseum. 5. Shell heart-shaped ; valves compressed 

 and keeled, with the anterior side concave ; 

 umbones approximated. 



Cardium roseum ■. Chemnitz, vi. p. 154. t. 14. f. 147 and 

 148. Gmelin, p. 3245. Wood's Conch, p. 239. t. 57. 

 f. 6. 



Cardium Cardissa Var. C. Bruguiere Enc. Meth. p. 208, 



Cardium impressum. Solander's MSS. 



Cardium, No. 1. Schroeter Einl. iii. p. 52. 



