BIVALVIA. 
or 
“I 
1. Mopiota MopioLus, Linneus. Tab. VIII, fig. 1, a—d. 
Myritus mopioLus, Linn. Syst. Nat., ed. 12, No. 256, p. 1158, 1767. 
as = Da Costa. Brit. Conch., p. 219, t. 15, fig. 5, 1778, (right-hand fig.) 
— _ Chem. Conch. Cab., vol. viii, p. 178. 
== = Donov. Brit. Shells, vol. i, pl. 23, 1799. 
— = W. Wood. Ind. Test., p. 53, pl. 12, fig. 31, 1825. 
= — Miill. Zool. Danica, pl. 53. 
= —  Flem. Edin. Ency., vol. vii, pl. 203, fig. 22. 
_ curtus. Penn. Brit. Zool., p. 112, pl. 64, fig. 76, a. 
— curvirosTRATUS. Da Costa. Brit. Conch., p. 220, 1778. 
— UMBILIcATUS. Penn. Brit. Zool., ed. iv, vol. iv, p. 112, pl. 65, fig. 76. 
_— — Mont. Test. Brit., p. 164, 1803. 
_— — W. Wood. Ind. Test., pl. 12, fig. 49, 1829. 
— BARBATUS. Don. Brit. Shells, vol. ii, pl. 70, 1800. 
aa PaPuaNus. Wyst. Coq. Foss. de Belg., p. 271, 1844. 
Moprona papuaNa? Desh. 2d ed. Lam., t. vii, p. 18. 
— — Brown. Brit. Conch. Mlust., pl. 29, figs. 1—4, 1827. 
_— — Say. Amer. Conch., pl. 45. 
— — Leach. Zool. Miscel., vol. ii, p. 33. 
— mopiouus. Turt. Brit. Biv., p. 199, pl. 15, fig. 3, 1822. 
= _ S. Wood. Catalogue, 1840. 
— — Dekay. Nat. Hist. New York Zool., p. 185, pl. 24, fig. 257, 1843. 
— —_ Forb. and Hanl. Hist. Brit. Moll., vol. ii, p. 182, pl. 44, figs. 1, 2, 
1849. 
= _ Midd. Malac. Ross., loc. cit., p. 537, 1849. 
—_— vuLeGaRIS. Flem, Brit. An., p. 412, 1828. 
—_ — Lovén. Ind. Moll. Scand., p. 33, 1846. 
— — Alder. Cat. Moll. North. and Durh., p. 81, 1847. 
— GRANDIS. Phil, En, Moll. Sic., vol. ii, p. 51, t. 15, fig. 13, 1844. 
Ency. Meth., p. 219, fig. 1. 
Spec. Char. Testa oblongo-ovata, gibba, levigatd ; margine dorsali antico brevissimo ; 
. postico producto, subrecto ; margine ventrali subsinuato ; extremitate utraque rotundato. 
Shell oblong-ovate, tumid, and smooth; anterior dorsal margin very short; 
posterior much produced, with hinge-line nearly straight ; ventral margin subsinuated, 
and both extremities rounded. 
Locality. Cor. Crag? 
Red Crag, Sutton. 
Mam. Crag, Postwick, Bridkington. 
Recent, Britain, N. Seas, Boreal, America, Mediterranean ? 
A few specimens only of this fine shell have been found by myself in the Red Crag, 
where it does not appear to have been abundant, although occasionally fragments have 
been met with at distant localities, testifying its somewhat general distribution in that 
deposit ; a few fragments also of a Modiolu of a similar form are in my cabinet from 
the Coralline Crag at Ramsholt, but the hinge-line being imperfect, I am unable to 
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