CARDIUM. 283 



contains it. This specimen undoubtedly belongs to the 

 present species ; and Mr. Dillwyn was, I believe, as care- 

 ful as I have endeavoured to be, in the conservation of 

 such proofs of authenticity. Bruguiere and Lamarck 

 described a tropical species as C. elongatum : otherwise 

 that name is more appropriate than fasciatum in respect 

 of our shell. The C. fasciatum of Gmelin is different, 

 having been derived from a figure of Knorr; but his 

 species is obsolete. The late Mr. G. B. Sowerby pro- 

 posed to change the name fasciatum to ovale, and Dr. 

 Leach to that of zonatum. It is the C. elongatum of 

 Turton and of most other writers on British concho- 

 logy, C. exiguum of Macgillivray, and (in a younger 

 state) probably C. scabrum of Philippi. It is also the 

 C. rubrum and C. arcuatum of Reeve, who by his refer- 

 ences to Montagu appears to have considered the pre- 

 sent species identical with Lascea rubra and Loripes 

 divaricatus. His descriptions and figures were taken 

 from shells in Mr. Cuming's collection. 



'<\* 7. C. NODO'STJM *, Turton. fl .35-. 



C. nodosum, Turt. Conch. Dith. p. 186, tab. 13. f. 8; F. & H. ii. p. 22, 

 pi. xxxii. f. 7. 



BODY subglobose, of a whitish colour, and semitransparent : 

 mantle edged with white pointed filaments, which correspond 

 with the ribs of the shell : tubes very short, pale yellow, each 

 having 10 or 12 flake-white cirri at the orifice, and red points 

 at the base, besides longer and curved white filaments above, 

 below, and on the sides of both tubes ; from the excurrent tube 

 protrudes a retractile valve : gills semioval, the upper not half 

 the length or breadth of the lower ones : palps very small 

 and triangular, pectinated more strongly above than below, 

 like the gills : foot white, moderately long, subcylindrical, with 

 a slight bend or elbow. 



SHELL obtusely triangular, convex, gibbous near the beaks, 

 * Covered with knots. 



