134 MOLLUSCA FROM THE CRAG. 



1. Cryptodon sinuosum, Donovan. Tab. XII, fig. 20, a, b. 

 Venus sinuosa. TJon. Brit. Shells, t. 42, fig. 2, 1801. 

 Tellina flexcosa. 'Mont. Test. Brit., p. 72, 1803. 



— — Mat. and Rack. Liun. Trans., vol. viii, p. 56, 1807. 



— — Turt. Conch. Diet., p. 17", 1819. 



— — W. Wood. Ind. Test., p. 22, pi. 4, fig. 78, 1825. 

 Amphidesma FLExnosA. Lam. Hist. Nat. des An. s. Vert., t. v, p. 492, 1818. 

 TnvASiUA FLEXUOSA. " Leach, MS.," Lam. Loc. cit. Sup., t. v, p. 492, 1818. 

 LuciNA siNCATA. Lam. Loc. cit., t. V, p. 543, 1818. 



— — Brown. Illust. Brit. Conch., pi. 17, figs. 4, 6, 1827. 



— SINUOSA. Forbes. Report on /Egean Invert., p. 182, 1843. 



— — Thorpe. Brit. Mar. Conch., p. 74, 1844. 



— FLEXUOSA. Flem. Brit. Ann., p. 442, 1828. 



— — Gould. Invert. Massach., p. 71, fig. 52, 1841. 



— — Forb. and nanl. Hist. Brit. Moll., vol. ii, p. 54, pi. 35, fig. 4, 1849. 



— — Reeve. Conch. Icon. Lucina, pi. xi, fig. 62. 



— Sarsii. Id. - - - pi. ix, fig. 52. 



— GooDHALU. J. Sow. Geol. Trans., 2d Ser., vol. v, pi. 8, fig. 7, 1834. 

 Cryptodon flexuosum. Turt. Brit. Biv., p. 121, pi. 7, figs. 9, 10, 1822. 



— — Broum. Illust. Brit. Concli., 2d ed., pi. 39, figs. 4, 5. 



— — MoUer. Ind. ;\IolI. Groenl., p. 20, 1842. 



_ _ Jlder. Cat. Moll. Korth. and Durh., p. 91, 1847. 



ff/ — BisiNUATu:f(. S. TJ'ood. Catalogue, ISAO.p '-tf- 



I Ptyciiina biplicata. FUl. En. Moll. Sic, vol. i, p. 15, t. 2, fig. 4, 1836. 



AxiNUs UNiCARiNATUS. Nxjst. Rech. Coq. Foss. d'Anv., p. 6, pi. 1, fig. 22, 1835. 



— Benedenii. Be Koninck. Des. Coq. Foss. Arg. Boom, p. 35, pi. 11, figs. 2, 3, 



1837. 



— angulatus. Nyst (not Sowerby). Coq. Foss. de Belg., p. 141, pi. 0, fig. 13, 1844. 



— — Michel. Desc. des Terr. Mioc. de I'ltal. Septen. (Haarlem Trans.), 



p. 118, pi. 4, figs. 23, 23*, 1847. 



— FLEXuosus. Lovin. Ind. Moll. Seand., p. 38, 1846. 



— Sarsii. Id. - • - p. 38, „ 



»S/y('C. Cliar. Testa ovato-orhiculari vel suhhexagond, lavir/atd, tenui, mbpcllucidu, 

 Imiiidd, subaqinlateru ; latere jjofitico /nplicato, maryinc vcntrali produdo, lunula cordato- 

 ovatd, mai/nd, impressd. 



Shell ovatcly orbicular, with an in'cgularly hexagonal outline, smooth, thin and 

 subpellucid, tumid, and nearly equilateral; posterior side with two folds or furrows, 

 ventral margin produced, and a large and deeply impressed heart-shaped lunule. 



Diameter, \ an inch. 



LocaWij. Cor. Crag, Sutton. 



Recent, .I'^gcan Sea, Britain, Scandinavia, and North America. 



This species is not at all abundant. There is no doubt of its identity with the recent 

 British shell, and I have given it as an inhabitant of the North West Coast of 

 America, upon the authority of that accurate observer, Dr. Gould. A specimen 



