BIVALVIA. . 67 
Arca unpaTa. Broc. Conch. Foss. Subap., p. 489, 1814. 
— poLtyoponTa. Broce. -  - - p- 490, 1814. 
— FiamMuLata. Lenieri. fide Philippi. 
GLYCIMERIS ORBICULARIS. Da Costa. Brit. Conch., p. 168, p. 11, fig. 2, 1778. 
PECTUNCULUS GLYCIMERIS. Turt. Brit. Biv., p. 171, t. 12, fig. 1, 1822. 
— — Brown. Illust. Conch. Gr. Brit., pl. 25, figs. 8, 9, 1827. 
= —_ Crouch. Int. Lam. Conch., pl. 8, fig. 11, 1827. 
ae — Reeve. Conch. Icon. Pectunce., pl. 3, fig. 12. 
— — Duward. Mem. Geol. Soc. de Fr., t. ii, par. 11, p. 267, No. 1, 
1837. 
= —_— Forb. and Hanl. Hist. Brit. Moll., vol. ii, p. 245, pl. 46, 
figs. 4—7, 1849. 
— pitosus. Turt. Brit. Biv., p. 172, t. 12, fig. 2, 1822. 
— _ Schum. Essai d’un Nouy. Syst. des Vers. Test., p. 172, pl. 19, 
fig. 3, 1817. 
— — Brown. Mlust. Conch. G. B., pl. 25, figs. 10, 11, 1827. 
— —_ Blainv. Man. Malac., pl. 65 bis, fig. 3, 1825. 
— = Reeve. Conch. Icon. Pectunc., pl. 3, fig. 13. 
— — G. Sowerby, Jr. Conch. Man., fig. 134, 1843, 
— — G. Sow. Genera, No. 5, fig. 1. 
— —_ S. Wood. Mag. Nat. Hist., 1840, p. 13, fig. 7. 
— — Nyst. Coq. Foss. de Belg., p. 247, pl. 19, figs. 6, 7, 1844. 
_—, unpatus. Turt. Brit. Biv., p. 173, t. 12, figs. 3, 4, 1822. 
— pEcussatus. Id. - p: 1738, t. 12; fig. 5. 
— NuMARIUS. Turt. Brit. Biv., p. 174, t. 12, fig. 6, 1822. 
— VARIABILIS. J. Sow. Min. Conch., t. 471, fig. 1, 1824. 
— — Woodward. Geol. of Norf., p. 43, 1833. 
— — Id. Coq. Foss. de Belg., p. 249, pl. 20, fig. 1, a—b, 1844. 
— = Phil. En, Moll. Sic., vol. ii, p. 45, 1844. 
— PoLyoponTa. Goldf. Pet. Germ., vol. ii, p. 161, t. 126, fgs. 6 & 7, a—d. 
— PULVINATUS. Brongn. Vincent., p. 77, pl. 6, figs. 15, 16, 1823. 
— — ? Bast. Bord. Foss., p. 77, No. 2, 1825. 
— — ? Dubois de Mont. Conch. Foss. de Wolhyn., p. 64, pl. 7, 
figs. 7, 8, 1831. 
— suBoBLIquUs. S. Wood. Mag. Nat. Hist., 1840, p. 233, pl. 13, fig. 6. 
_ TRANSVERSUS.? Dubois de Mont. Coq. Foss. de Wolhyn., p. 65, pl. 7. fig. 9. 
— NUMIFORMIS. ? Id. - - = . p- 66, pl. 7, fig. 6. 
_ LATIAREA. Michelotti. fide Sismonda. 
— Pusittus? Dward. Mem. Geol. Soe. de Fr., t. 2, pt. 2, p. 276, 1837. 
Ency. Method., p. 310, figs. 2 & 3 
Arca. Smith. Strat. Identif. Craig, t. 2, fig. 7, 1816. ‘ 
Spec. Char. Testa variabile, suborbiculatd, subovatd, transversd, sepé obliquad sub- 
aquilaterd, compressa vel tumidd, costato-striatd ; margine crenulato. 
Shell variable, suborbicular, elongate or transverse, often oblique, subequilateral, 
compressed or tumid ; striated ; margin crenulated. 
Diameter, 3} inches. 
