PLATE V. 



Cyprina. 



Fig. 



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. 



8. I. cor, Linn. (C/iama.) — I. kibemica, Cardita cor. — Dublin, Skye, 

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



Cardium, or Cockle. 



4. C. pygma;um, 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. punctatum, Broc, C. nodosum, Turt. — C. scabrnm, Ph. — Ex- 



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



7. C. fasciatum, Mont. — C. elongatum, C. ovale, C. parvum, C. ru* 



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



8. C. suecicum, Loven.- — C. Swediense, Reeve, C. Loveni, Thompson. — 



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



9. C. aculeatum, Linn. — C. ciliare andparvum (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. 



10. echinatum, Linn. — C. mucronatum., C. spinosnm. — Brit. co. gene- 

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

 tubercles sharp. 



12. C. edule, Linn. — C. vulgar e, C. zonatum, C. obliquum, C. crenula- 



turn, C. rusticum. — Brit. co. generally. Common eatable, Cockle. 



13. C. norvegicum, Spenglcr. — C. lavigatum, C. senatum, C. oblon- 



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

 80 lath. Smooth, variegated when youig. 



