GINGLYMACONCHA. VENERID. 319 
apply to those found on our own coasts: I think it possibly 
applies to the following new species. 
5. CARDIUM TENUE. 
Shells thin, rotundately-cordate, with thirty rounded ribs ; 
the ribs and the interstices between them with transverse ele- 
vated, irregular, interrupted, broken, elevated lines, those be- 
hind very much elevated; the epidermis pale ferrugineous-testa- 
ceous; the umbones purplish. Length one inch and three- 
eighths ; height one inch and two-eighths. 
Var. 3. The epidermis entirely orange. 
I found this new species in 1821, in salt pools on a green 
marine conferva, very near the sea, near Bexhill in Sussex. 
The inside is purplish, the margins chestnut. 
Var. (3. was discovered by C. Stokes, Esq., at Limington, in 
great abundance. 
6. CARDIUM ZONATUM. 
Shells rotundately-cordate, semitransparent, with the ribs 
approximating and broadly rounded, sculptured with transverse 
elevated lines ; the interstices or grooves simple. Length two- 
eighths and a quarter of an inch ; height three-eighths of an 
inch. 
Cardium fasciatum, Mont. Test. Brit. Suppl. 30. t. xxvu. 
f.6; Flem. Edinb. Encycl. vii. 92; Wood, Gen. Conch. i. 
215; Dill. Dese. Cat. 130; Turt. Conch. Dict. 32. 
Var. 8. The ribs on the hinder and sometimes also on the 
lower aspect tuberculated. 
This species is found rather rarely on the sandy shores of 
England, Wales, Scotland and Ireland. 
7. CARDIUM EXIGUUM. 
Shells obliquely cordate, somewhat angulated; the hinder 
aspect very short, with twenty-two tuberculated ribs ; the in- 
terstices with excavated punctures. Epidermis dirty white or 
brown. Length five-eighths of an inch; height half an inch. 
Cardium exiguum, Lister, Conch. t. ecexvil. f. 154; Walker, 
