NiLSSOX, S.Petrificata Suecana Forinationis (,'retacete, desci-ipta et iconibus illnstrata. l.niid, 1827. X6Tr,iN(;, F. Die Fauna der l)altisclieu Cenoman-Gescliiebe. Palseont. AhhandL, vol. ii, Heft k Rerliii, 1885. [Lamelliln'aiielis, pp. 14-SC).] Eutwurf einer (jliedeniug dcr Xreidefoi'iiiation in Svrieii und Palastina. Zeitschr. il. ih'utsch. i/eol. Gesellsch., vol. xxxii BIBLIOGRAPHY OF THE Oebigny, a. J)'. Paleontologie Fran9aise. Description ties MoUusques et Rajonnes Fossiles.

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Shell moderately convex, oval or subtriangular ; height a little greater than length ; outline rounded, except the antero-dorsal margin, which is nearly straight and rather long. Apical angle from 105 to 110. Umbones rather small, close together. Anterior area slightly depressed, with small radial ribs. Anterior ears small ; posterior larger, with growth-lines and faint radial ribs.

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