06. C. punctatum, Broc., C. nodosum, Turt.—C. scabrum, Ph.—Exmouth, Falmouth, Galloway, etc., Mc. Angular behind.
07. C. fasciatum, Mont.—C. elongatum, C. ovale, C. parvum, C. rubrum (young).—Various Brit. loc., Mr.
08. C. suecicum, Loven.—C. Swediense, Reeve, C. Loveni, Thompson.—Down, Oban, Zetland, 30 to 70 fath., Rr. Oval, equally ribbed.
09. C. aculeatum, Linn.—C. ciliare and parvum (young).—S. Devon, Mc. Thin, oblique, with thorn-like tubercles; interstices of ribs smooth.
10. C. rusticum, Linn.—C. tuberculatum, Linn.?—Paignton, Torbay, Velvet Strand, Dublin co., Mc. Thick, not oblique, coarsely wrinkled.
11. C. echinatum, Linn.—C. mucronatum, C. spinosum.—Brit. co. generally, mud and sand, 7 to 80 fath. Oblique, wrinkled; hinder tubercles sharp.
12. C. edule, Linn.—C. vulgare, C. zonatum, C. obliquum, C. crenulatum, C. rusticum.—Brit. co. generally. Common eatable, Cockle.
13. C. norvegicum, Spengler.—C. lævigatum, C. serratum, C. oblongum, C. Pennantii.—Brit. co. generally. Sand and gravel, 15 to 80 fath. Smooth, variegated when young.
Lucina.
14. L. divaricata, Linn. (Tellina.)—Cardium arcuatum, L. arcuata, commutata.—Near Falmouth, 20 fath., Rr. Rounded, with diverging ribs.