PLATE V, 



Cyprina. 

 Rg. 



1. C. ISLANDICA, Linn. {Venus.) — C. vulgaris, V. mercenaria. — Brit. 



CO. generally, most abundant north, 5 to 80 fath. Oval, with 

 thick epidermis. 



Circe. 



2. C. MINIMA, Mont. {Venus.) — Gen. Cyprina and Cytherea triangu- 



laris, apicialis, Cyrillii, minuta. — Guernsey, Cornwall, Milford 

 Haven, Clyde, Bantry Bay, etc., 10 to 50 fath., C. 



ISOCARDIA. 



3. I. COR, Linn. {Chama) — /. hiberyiica, Cardita cor. — Dublin, Skye, 



etc.j Mc. Heart-shaped, beaks coiled. 



Carditjm, or Cockle. 



4. C. PTGMJiDM, Donovan. — C. exiguum. — Heme, Sark, Weymouth, 



Zetland, Bantry Bay, 5 to 50 fath., Mc. Hinder side large, 

 angular. 



5. C. PAPILLOSUM, Poli. — Guernsey, St. Martin's Port, Jeffreys, R. 



Rather rounded, equally ribbed and grained. 



6. C. punctattjm, Broc, C. nodosum, Turt. — C. scahrum. Ph. — Ex- 



mouth, Falmouth, Galloway, etc., Mc. Angular behind. 



7. C. fasciatum, Mont. — C. elongatum, C. ovale, C. parvv.m, C. ru- 



brum (young). — Various Brit, loc, Mr. 



8. C. suecicum, Loven. — C. Sicediense, Reeve, C. Loveni, Thompson. — 



Down, Oban, Zetland, .30 to 70 fath., Rr. Oval, equally ribbed. 



9. C. aculeatum, Linn. — C. ciliare anii jxirvnm (young). — S. Devon, 



Mc. Thin, oblique, with thorn-hke tubercles ; interstices of 

 ribs smooth. 



10. C. EusTicuM, Linn. — C. tnbercnlatum, Linn.? — Paignton, Torbay, 

 Velvet Strand, Dublin co., Mc. Thick, not oblique, coarsely 

 wrinkled. 



10. ECHiNATUM, Linn. — C. muoronatum., C. spinosum. — Brit. co. gene- 

 rally, mud and sand, 7 to 80 fath. Oblique, wrinkled ; hinder 

 tubercles sharp. 



12. C. edule, Linn. — C. vulgare, C. zonatum, C. ohliquum, C. crenula- 



tum, C. rusticvM. — Brit. co. generally. Common eatable, Cockle, 



13. C. norvegicum, Spengler. — C. lavigatiim, C. serrafum, C. ohlon- 



gum, C. Pennantii. — Brit. co. generally. Sand and gravel, 15 to 

 80 lath. Smooth, variegated when young. 







