CARDIUM. j 17 



early stage of its growth, the line on the ribs appears more 

 elevated, and the spines more compressed. Mr. Montagu, 

 under the name of C. nodosum, has constituted rather too 

 uncertain a species to be retained, which, he says, resembles 

 the young of C. echinatum, but that the latter are more 

 globose, and have their ribs sharper, and the tubercles more 

 pointed and distant. 



ciliatum. 15.. Shell somewhat heart-shaped, with 

 crowded somewhat triangular spinous ribs. 



Cardium ciliatum. Fabricius Fauna Gra.nl. p. 410. Gme- 

 lin, p. 3248. 



Inhabits the North Seas, and is plentiful on the coasts of 

 Greenland. Fabricius. 



Fabricius describes this species to be an inch and a half long, 

 and nineteen lines broad, and says it resembles C. echinatum, 

 but has from thirty-two to thirty-eight ribs ; shell thick, 

 oblique, convex, whitish grey under the epidermis, and the 

 inside white ; ribs spinous on the ridges, rather convex in 

 the middle of the shell, and the lateral ones triangular, with 

 the intermediate grooves striated transversely. Mr. Wood 

 says, that this is the young of C. echinatum, but from the 

 number of the ribs, it is more likely to belong to C. spino- 

 sum. 



tuberculatum. 16. Shell somewhat heart-shaped, 

 with the ribs obtuse, knotty, and transversely 

 wrinkled. 



Cardium tuberculatum. Linnaus Syst. Nat. p. 1 122. Born. 

 Mus. p. 44. Chemnitz, vi. p. 179. t. 17- f. 173. 

 Schroeter Einl. iii. p. 36. Gmelin, p. 3248. Bruguiere 

 Enc. Meth. p. 218. Donovan, iii. t. 107. f. 2. Mon- 

 tagu Test. p. 568. Maton and Racket, in Lin. Trans. 

 viii. p. 64. Dorset Cat. p. 31 . t. 2. f. 2. Wood's Conch, p. 

 210. t. 50. f. 1 and 2. 

 Rumphius, t. 48. f. 11. Seba, iii. t. 86. f. 7. Enc. Meth. 

 t. 298. f. 2. 

 Inhabits the Mediterranean. Lister. Adriatic. Humphreys. 

 Coasts of Provence and Languedoc. Bruguiere. Naples. 

 Ulysses. Britain. Pultenei/,,$c. 

 This shell in size resembles C. echinatum, but is said to be 

 longer in proportion to its breadth, thicker, more rounded 

 at the anterior end, and the ribs only tubercular, or but very 

 rarely armed with spines ; Mr. Montagu, -however, in his 

 supplement, page 33, has given some strong reasons for 



