BIVALVIA. 35 
9. PECTEN OPERCULARIS, Linnaeus. Tab. VI, fig. 2, a—d. 
List. Hist. Conch., lib. i, fig. 27. 
OsTREA OPERCULARIS. Jinn. Syst. Nat., p. 1147, No. 202, 1767. 
PECTEN 
_ Born. Mus. Ces. Vindobon, p. 106, 1780. 
— Schrot. Hinleit in die Conchyl., iii, p. 317, t. ix, fig. 3, 1784. 
— W. Wood. Ind. Test., pl. 10, fig. 43. 
SUBRUFA. Don. Brit. Shells, vol. i, pl. 12, 1799. 
LINEATA. Don. Brit. Shells, vol. iv, pl. 116, 1803. 
SANGUINEA. Poli. Test. Sicil., vol. ii, pl. 28, figs. 7-8. 
— ? Knorr. Delices des Yeux., t. iv, fig. 1, 1766. 
PLEBEJA. Broc. Conch. Foss. Subap., p. 577, t. 14, fig. 10, 1814. 
pictus. Da Costa. Brit. Conch., p. 144, pl. 9, figs. 1, 2, 4, 5, 1778. 
LINEATUS. Id. - - p- 147, pl. 10, fig. 8. 
—_ Mont. Test. Brit., pp. 147, 579, 1803. 
_ Chenu. Conch. Ilust. Pecten., pl. 30, figs. 1, 2. 
OPERCULARIS. Chem. Conch. Cab., vii, p. 341, pl. 67, fig. 646, 1782. 
— Mont. Test. Brit., p. 145, 1803. 
— Lam. Hist. des An. Sans. Vert., vi, p. 172, 1822. 
— Brown. Ulust. Conch. Gr. Brit., pl. 33, fig. 1, 1827. 
= Payr. Cat. des Moll. de la Corse., p. 77, 1826. 
— Chenu. Conch. Illust. Pecten., pl. 48, fig. 3. 
— Goldf. Pet. Germ., t. 1, p. 62, tav. 95, fig. 6, 1833. 
— Phil. En. Moll. Sic., p. 82, t. 6, fig. 2, 1836. 
— G. B. Sow., Jr. Thes. Conch., p. 53, pl. 17, figs. 141—146, 1847. 
_ Lovén. En. Moll. Scand., p. 30, 1846. 
oa Forb. and Hanl. Hist. Brit. Moll., vol. u. p. 299, pl. L, fig. 3° 
Li, figs. 5, 6; Liu, fig. 7, 1849. 
sutcatus. J. Sowerby. Min. Conch., t. 393, fig. 1, 1823. 
— Woodward. Geol. of Norf., p. 44, 1833. 
Nyst. Rech. Coq. Foss. Prov. d’Any., p. 19, 1835. 
RECONDITUS. J. Sowerby, Min. Conch., t. 575, figs. 5, 6, 1827. 
— Nyst. Rech. Coq. Foss. Proy. d’Anv., p. 19, No. 73, 1835. 
_ Potiez et Mich. Cat. Moll. de Douai, p. 77, pl. 49, figs. 1, 2. 
suBRUFUS. Turt. Brit. Biv., p. 210, t. 17, fig. 1, 1822. 
Avupouinit. Payr. Cat. Moll. de Cors., p. 77, pl. 2, figs. 8, 9, 1826. 
PLEBEIUS. J. Sowerby. Syst. Ind., p. 244, 1835. 
— Bronn. Leth. Geog., ui, p. 916, t. 39, fig. 16, 1838. 
Sowersyi. Myst. Conch. Foss. de Belg., p. 293, pl. 22, fig. 3, 4', and pl. 22 bis. 
Matvinx. Dubois de Montp. Conch. Foss. Wolhyn. Podol., p. 71, pl. 8, figs. 2, 3. 
FLAVUS ? Td. - - - - -  p. 72, pl. 8, fig. 7. 
RECTANGULUS? Td. - - - - - p- 72, pl. 8, figs.10,11. 
PULCHELLINUS? Id. - - - - = p70) ple Oy te. Se 
RADIANS? Nyst. Coq. Foss. de Belg., p. 294, pl. 24, fig. 3, 1844. 
20-suLcatus. Miill. (fide Lovén.) 
Description de PEgypt Hist. Nat., pl. 13, figs. 5, 1—4, and pl. 14, fig. 8, 1826. 
Ency. Meth., pl. 212, fig. 2. 
Dale. Hist. and Antiq. of Harwich, p. 291, t. xi, fig. 1, 1730. 
Spec. Char. Testa suborbiculari, subequivalvi, longitudinaliter radiata radiis 18—26, 
