CARDIUM. 223 



CITRON COCKLE. 

 PL 54. /. 3. Linnean Society's Cabinet. 



21. Cardium ci tritium, C. testa obovata, lavi, striis obsoletis, margine 

 interiore serrato. Linn. Syst. Nat. ed. 12. p. 1123. Linn. Gmel. 

 p. 3251. C. serratum. 



Shell obovate, smooth, with obsolete striae ; margin serrated within. 



Gualt. Test. pi. 82. f. A. Chem. Conch, pi. 18. f. 189. 



A thin, smooth, convex, yellowish shell, with faint 

 longitudinal striae, sometimes not to be perceived without 

 the help of a lens ; the anterior margin is strongly 

 stained of an orange colour. The inside is white and 

 orange, and the margin is crenated. 



Inhabits the Mediterranean, the Indian ocean, the 

 coast of South America, and the shores of the West 

 India islands. 



It is constituted a distinct species from the C. Iceviga- 

 tum, by Linnaeus, under the name of C. serratum, and 

 occurs in Chemnitz, and the Linnaean Society's Cabi- 

 net, under the more appropriate title of C citrinum. 



OBLONG COCKLE. 

 PI. 55. f. 1. Linnean Society's Cabinet. 



22. Cardium oblongum. C. testa jlavicante, oblonga, turgida, costata, 

 anterius glabra, cordata, margine crenata. Linn, Gmel. p. 3254. 



Shell yellowish, oblong, turgid, ribbed, smooth before, heart-shaped, 

 margin crenated. 



Chem. Conch. 6. pi. 19. f. 190. Born Test. pi. 3. f. 8. Favanne Conch. 

 pi. 53. f. L. 



This shell is described, by Bruguiere, under the name 



