134 MOLLUSCA FROM THE CRAG. 
1. Crypropon sinuosum, Donovan. Tab. XII, fig. 20, a, 6. 
Venus stnvosa. Don. Brit. Shells, t. 42, fig. 2, 1801. 
TELLINA FLEXUOSA. Mont. Test. Brit., p. 72, 1803. 
— _— Mat. and Rack. Linn. Trans., vol. viii, p. 56, 1807. 
— — Turt. Conch. Dict., p. 177, 1819. 
— — W. Wood. Ind. Test., p. 22, pl. 4, fig. 78, 1825. 
AMPHIDESMA FLEXUOSA. Lam. Hist. Nat. des An. s. Vert., t. v, p. 492, 1818. 
Tuyasmra FLEXUOSA. “ Leach, MS.,” Lam. Loc. cit. Sup., t. v, p. 492, 1818. 
Lucina sinuata. Lam. Loc. cit., t. v, p. 543, 1818. 
— — Brown. Must. Brit. Conch., pl. 17, figs. 4, 6, 1827. 
—  sinuosa. Forbes. Report on Aigean Invert., p. 182, 1843. 
—_ — Thorpe. Brit. Mar. Conch., p. 74, 1844. 
— rLexuosa. Flem. Brit. Ann., p. 442, 1828. 
— ‘— Gould. Invert. Massach., p. 71, fig. 52, 1841. 
== — Forb. and Hanl. Hist. Brit. Moll., vol. ii, p. 54, pl. 35, fig. 4, 1849. 
— _ Reeve. Conch. Icon. Lucina, pl. xi, fig. 62. 
— Sarsit. Id. - - - pl. ix, fig. 52. 
— Goopuatit. J. Sow. Geol. Trans., 2d Ser., vol. v, pl. 8, fig. 7, 1834. 
Crypropon FLexuosum. Turt. Brit. Biv., p. 121, pl. 7, figs. 9, 10, 1822. 
== — Brown. Illust. Brit. Conch., 2d ed., pl. 39, figs. 4, 5. 
— — Miller. Ind. Moll. Groenl., p. 20, 1842. 
=o — Alder. Cat. Moll. North. and Durh., p. 91, 1847. 
— BistnuatuM. S. Wood. Catalogue, 1840. 
Prycuina prpiicata. Phil. En. Moll. Sic., vol. i, p. 15, t. 2, fig. 4, 1836. 
AxInus untcarinatus. Nyst. Rech. Coq. Foss. d’Anv., p. 6, pl. 1, fig. 22, 1835. 
—  Benepentt. De Koninck. Des. Cog. Foss. Arg. Boom, p. 35, pl. 11, figs. 2, 3, 
1837. 
— aneuiatus. Nyst (not Sowerby). Coq. Foss. de Belg., p. 141, pl. 6, fig. 13, 1844. 
— Michel. Desc. des Terr. Mioc. de /’Ital. Septen. (Haarlem Trans.), 
p. 118, pl. 4, figs. 23, 23*, 1847. 
— ruipxvosus. Lovén. Ind. Moll. Scand., p. 38, 1846. 
—  Sarxsir. Id. - - =) Pa ooeass 
Spec. Char. Testd ovato-orbiculari vel subhewagond, levigatd, tenu, subpellucida, 
tumidd, subequilaterd ; latere postico biplicato, maryine ventrali producto, lunuld cordato- 
ovatd, magnd, impressd. 
Shell ovately orbicular, with an irregularly 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. 
Locality. Cor. Crag, Sutton. 
Recent, gean 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 
