CARDIUM. ]31 



often appear as if they had been worn off on the upper part 

 towards the hinge. C.fasciatum of Gmelin is the Linnaean 

 C. rusticum. 



elongatum. 44. Shell sub-oval, angulated, com- 

 pressed, with twenty-one rounded and slight- 

 ly wrinkled ribs. 



Cardium elongatum. Montagu Test. p. 82. Maton and 

 Racket, in Lin. Trans, viii. p. 67. Wood's Conch, p. 

 214. 

 Inhabits the coast of Devonshire. Montagu. 

 Mr. Montagu describes this shell to be a quarter of an inch in 

 diameter, compressed, sub-oval, of a yellowish white, or 

 pale rufous colour, with twenty-one rounded and slightly 

 wrinkled ribs ; umbo not central, and the posterior side some- 

 what elongated and angulated. 



rubrum. 45. Shell minute, rounded, convex, gla- 

 brous, and pellucid; hinge with nearly obso- 

 lete primary teeth, and conspicuous lateral 

 ones. 



Cardium rubrum. Montagu Test. p. 83. t. 27- f. 4. Maton 

 and Racket, in Lin. Trans, viii. p. 66. Wood's Conch. 

 p. 213. 



Inhabits the sea on the coast of Devonshire. Montagu. 



Mr. Montagu describes this shell to be about an eighth of an 

 inch broad, and not quite so long ; convex, smooth, glossy, 

 pellucid, red, rounded at both ends, and the hinge not quite 

 central ; inside glossy red, and the margin plain ; it has been 

 placed in this genus on account of its hinge, but has no other 

 appearance of being a cardium. 



muricatulum. 46. Shell minute, heart-shaped, 

 opake, and the margin muricated. 



Cardium muricatulum. Adams's Micros, p. 644. t. 14, 

 f. 44. Montagu Test. p. 85. Maton and Racket, in 

 Lin. Trans, viii. p. 68. Wood's Conch, p. 215. 

 Walker's Minute Shells, f. 84. 

 Inhabits the sea-shore at Sheppy Island in Kent. Walker. 

 This species is so minute as to be hardly observable with- 

 out a microscope, and is white, without any coloured mark- 

 ings. 



K 2 



