BIVALVE SHELLS. 199 



Nymphae magnae, arcuatae, ligamentum externum, erassum, elon- 

 gatum aceipientes. Impressio pallii simplex, postice paulo latior. 



Veneres, pt., Ferussac, Tab. Syst. p. 44 (1821). 

 Conchge marinae, pt., Lamk. 

 Veneraceae, pt., Menke, Syn. ed. 2. p. 114. 

 Veneridse, pt., Leach, Journ. Phys. 1819, p. 465. 



Flem. Brit. Anim. p. 409. 



Gray, Syn. B. M. 1842, pp. 74, 91. 

 Venerina, pt , Macgill. 

 Veneraceae, Menke, Syn. 69. 

 Cycladina, pt., Latr. Fam. Nat. 1825. 

 Cyclas, sp., Cuv. R. A. ed. 2 (1830). 

 Cyprinidae, pt., Forbes 8f Hanley, Brit. Moll. p. 239. 

 CyprinadjE, Gray, Ann. %■ Mag. N. H. 1853. 



The front hinge tooth of the left valve conical, rugose, like the 

 anterior lateral tooth of the genus Venus ; the hinder of the 

 left valve thin, compressed ; the central of the right valve com- 

 pressed ; the hinder very broad, with a deep groove ; anterior 

 lateral tooth none ; hinder of right valve compressed, separated 

 from the dorsal margin by a deep groove. — Gray, Ann. &■ Mag. 

 'N. H. 1853. 



Genus 1. CYPRINA. 



(Character same as of family.) 



Concha, Lister (1678), Anim. Angl. p. 173. pl. 4. f. 22. 

 Pectunculus, Lister (1685), Conch. pl. 272. 



Da Costa (1778), Conch. Brit. p. 183. 

 Venus (sp.), Limi. (1767) Syst. Nat. ed. 12. p. 1131. no. 124. 



MuUer (1776), Zool Dan. Prodr. p. 246; (1788) Faun. 

 Suec. i. 29. pl. 28. 



Fabricius (1780), Faun. GrcRnl. p. 411. 



Montagu (1803), Test. Brit. p. 104. 



Sow. (1813) Min. Conch. pl. 21. 

 Cardia, Olafsen (1774), Voy. en Isl. p. 96. pl. 11. f. 8. 

 Arctica, Schumacher (1817), Essai, p. 145. pl. 13. 



Sow.jun. (1842) Conch. Man. p. 73. 

 Cyprina, Lamk. (1812) Extrait du Cours, p. 107 ; (1818) An. s. 

 Vert. V. 556. 



1. Cyprina islandica. B.M. 



C. testa ovato-turgida, cordata, inaequilaterali, antice rotundata, 

 postice obscure subangulata, intus albo-cretacea, extus epi- 

 dermide fusco-virente, nitido, striato vestita; cardine lato, 

 sohdo ; dente anteriore pyramidali, triangulari. 



