CARDIUM. 125 



with extremely minute longitudinal and slightly cancellated 

 strife, except at the anterior end ; the margin in the inside 

 is serrated towards the posterior end. 



papyraceum. 30. Shell somewhat heart-shaped, 

 brittle, pellucid, and cinereous, with nume- 

 rous narrow longitudinal ribs. 



Cardium papyraceum. Chemnitz, vi. p. 190. t. 18. f. 184. 

 Gmelin, p. 3254. Bruguiere Enc. Meth. p. 231. Wood's 

 Conch, p. 230. t. 55. f. 5. 

 Cardium, No. 9- Schroeter Einl. iii. p. 55. 



Inhabits the Asiatic Ocean. Chemnitz. Coasts of Naples. 

 Ulysses. 



Shell about two inches long, two inches broad, and rather 

 more than an inch and a quarter high ; thin, brittle, pellucid, 

 of a dull whitish ash colour, marked on the inside with 

 purplish brown, or fulvous spots ; it has above fifty narrow 

 longitudinal ribs, which form corresponding crenatures on 

 the margin. I have bought this shell of Mr. Humphreys, 

 under the name of C. nitidum, by which I believe it is 

 generally known. 



rugatum. 31. Shell somewhat heart-shaped, with 

 obsolete slightly carinated longitudinal ribs, 

 and the anterior end produced, and gaping. 



Cardium rugatum. Gronovius Zooph. p. 278. t. 18. f. 5. 



Cardium apertum. Chemnitz, vi. p. 189- t. 18. f. 181 to 

 183. Bruguiere Enc. Meth. p. 226. Wood's Conch, p. 

 232. t. 56. f. 2. 



Cardium virgineum Var. £. Gmelin, p. 3253. 



Cardium tenerum. Solander's MSS. 



Cardium, No. 8. Schroeter Einl. iii. p. 55. 



Enc. Meth. t. 296. f. 5. 

 Inhabits the coasts of Jamaica. Gronovius. East Indies. 



Chemnitz. 

 Shell about nineteen lines long, twenty broad, and thirteen 



high; thin, brittle, whitish, rounded at the posterior, and 



produced at the anterior end, where it gapes considerably ; 



the inside is white, stained with purple in the middle, and 



on the anterior side. 



latum. 32. Shell transversely ovate, with longitu- 

 dinal muricated ribs, and the margin cre- 

 nated. 



