BIVALVIA. 33 
8. PEcTEN Pusio, Pennant. Tab. VI, fig. 4, a—e. 
Lister. Hist. Conch., lib. iii, par. 1, figs. 9, 18? and 23? 1789. 
Patitiotum? Chem. Conch. Cab., vii, p. 333, t. 67, figs. 635-6, 1784. 
OsTREA 
PrEcTEN 
minraTa. Born. Mus. Ces. Vind., p. 104, t. vii, fig. 1, 1780. 
MULTIsTRIATA. Poli. Test. Sicil., vol. ii, p. 164, t. 28, fig. 14, 1795. 
pusio. Don. Brit. Shells, vol. i, pl. 34, 17%. 
stnuosa. W. Wood. Ind. Test., p. 50, pl. 10, fig. 34, 1825. 
pusio. Penn. Brit. Zool., vol. iv, pl. 61, fig. 65. 
— Turt. Brit. Biv., p. 215, pl. 17, fig. 2, 1822. 
— Payr. Cat. Moll. de I’Ile de Cors., p. 74, 1826. 
— G. B. Sowerby. Genera, No. 31, fig. 6. 
— Phil. En. Moll. Sic., vol. i, p. 84, and vol. ii, p. 58, 1844. 
— Forb. and Hanl. Hist. of Brit. Moll., vol. ii, p. 278, pl. 50, figs. 4, 5; 
pl. 51, fig. 7. 
pistortus. Da Costa. Brit. Conch., p. 148, pl. 10, figs. 3, 6. 
— Mont. Test. Brit., p. 148, and Sup., p. 61, 1808. 
— Lovén. Ind. Moll. Seand., p. 30, 1846. 
stnuosus. Turt. Brit. Biv., p. 210, pl. 9, fig. 5, 1822. 
— Brown, IMlust. Conch. Gr. Brit., pl. 32, fig. 2, 1827. 
— Forbes. Geol. Surv. of Gr. Brit., vol. i, p. 86, 1846. 
sPinosus. Brown. Illust. Conch. Gr. Brit., pl. 33., fig. 8, 1827. 
striatus. J. Sowerby. Min. Conch., t. 394, figs. 2—4, 1823. 
— Dujard. Mem. Soc. Geol. de France, t. ii, pl. 2, p. 270, No. 3, 1837. 
— Nyst. Coq. Foss. de Belg., p. 301, pl. 15, fig. 1, 4, 4’, d, 1843. 
sERRATUS. Dubots. Conch. Foss. de Wolhyn. Podol., p. 73, pl. 8, fig. 5, 1831. 
GLorTa MARIS? Id. - - - p. 72, pl. 8, figs. 6 & 19, 1831. 
sauamuLosus. Desh. Exped. Sci. de Morea, pl. 5, fig. 7—11, 1833. 
timatus. Goldf. Pet. Germ., vol. ii, p. 59, pl. 94, fig. 6, a—d. 
— Chenu. Conch. Ilust. Pecten, pl. 49, fig. 5. 
gLonGatus? Goldf. Loc. cit., pl. 94, fig. 7, a—e. 
Hinyites pusio. G. B. Sow., Jr. Conch. Man., fig. 173. 
stnvosus. Desh. 2d ed. Lam., t. vii, p. 149, 1836. 
ost G. B. Sow., Jr. Thesaur. Conch., vol. i, p. 79, pl. 20, figs. 1—3, 1847. 
IRREGULARIS. Desh. Ency. Meth. Vers., t. ii, p. 273, No. 1. 
Spec. Char. Testa orbiculato-ovata, subequivalvi, equilaterali, radiata, radiis confertis, 
numerosis, 2—3 partitis, irregularibus, levibus aut scabris ; auriculis inequalibus. 
Shell orbiculato-ovate, subequivalve, equilateral with numerous close-set rays, in 
sets of two or three, irregularly scabrous, with very unequal auricles. 
Longitudinal diameter, 2 inches; height, 23ths of an inch. 
Locality. Cor. Crag, Sutton, Ramsholt, and Sudbourn. 
Red Crag, Sutton, Bawdsey, Walton Naze. 
Recent, Britain, Mediterranean, Bergen. 
This shell is abundant in both formations, and in the Coralline Crag at Ramsholt 
the two valves are often united. In the young state, the Crag shell so much resembles 
the recent specimens of the same size, that it cannot be considered otherwise than 
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a 
