BIVALVIA. 67 



Arca undata. Broc. Conch. Foss. Subap., p. 489, 1814. 



— POLYODONTA. Broc. - - " P- 490, 1814. 



— FLAMMULATA. Renieri. fide Philippi. 



Glycimeuis oebiculakis. Ba 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., pi. 25, figs. 8, 9, 1827. 



_ _ Ciwich. Int. Lam. Conch., pi. 8, fig. 11, 1827. 



— Reeve. Conch. Icon. Pectunc, pi. 3, fig. 12. 



— Dujard. Mem. Geol. Soc. de Fr., t. ii, par. 11, p. 267, No. 1, 



1837. 

 _ _ Forb. and Hani. Hist. Brit. Moll., vol. ii, p. 24.5, pi. 46, 



figs. 4—7, 1849. 



— PiLOSUS. Turt. Brit. Biv., p. 172, t. 12, fig. 2, 1822. 



_ _ Schtim. Essai d'un Nouv. Syst. des Vers. Test., p. 172, pi. 19, 

 fig. 3, 1817. 



— — Brown. lUust. Conch. G. B., pi. 25, figs. 10, 1 1, 1827. 



— — Blainv. Man. Malac, pi. 65 bis, fig. 3, 1825. 



— — Reeve. Conch. Icon. Pectunc, pi. 3, fig. 13. 



— — G. Sowerby, Jr. Conch. Man., fig. 134, 1843, 



— — G. Sow. Genera, No. 5, fig. 1 . 



_ _ S. TFood. Mag. Nat. Hist., 1840, p. 13, fig. 7. 



_ _ Nyst. Coq. Foss. de Belg., p. 247, pi. 19, figs. 6, 7, 1844. 



— UNDATUS. Turt. Brit. Biv., p. 173, t. 12, figs. 3, 4, 1822. 



DECUSSATUS. Id. - p. 173, 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, pi. 20, fig. 1, a—h, 1844. 



— — Phil. En. Moll. Sic, vol. ii, p. 45, 1844. 



— POLYODONTA. Goldf. Pet. Germ., vol. ii, p. 101, t. 126, figs. 6 & 7, a — d. 



— PULVINATUS. Bronyn. Vincent., p. 77, pi. 6, figs. 15, 16, 1823. 

 _ _ ? Bast. Bord. Foss., p. 77, No. 2, 1825. 



— ? Dubois de Mont. Conch. Foss. de Wolhyn., p. 64, pi. 7, 



figs. 7, 8, 1831. 



— SUBOBLIQUCS. S. TFood. Mag. Nat. Hist., 1840, p. 233, pi. 13, fig. 6. 



— TRANSVERSCS. ? Dubois de Mont. Coq. Foss. de Wolhyn., p. 65, pi. 7. fig. 9. 



— NUMIFORMIS. ? Id. .... p. 66, pi. 7, fig. 6. 



— LATIAREA. Michelotti. fide Sismonda. 



— pusiLLUs? Dujard. Mem. Geol. Soc de Fr., t. 2, pt. 2, p. 276, 1837. 



Ency. Method., p. 310, figs. 2 & 3. 

 Arca. Stnith. Strat. Identif. Craig, t. 2, fig. 7, 1816. 



Sjjec. Char. Testa variabile, suborbiculatd, siihovatu, transversa, scepe ohliqud siib- 

 cequilaterd, compressd vel tiimidd, costato-striatd ; marr/ine crenulato. 



Shell variable, suborbicular, elongate or transverse, often oblique, subequilateral, 

 compressed or tumid ; striated ; margin crenulated. 



Diameter, 3j inches. 



