. Bulletin of the United States Geological and Geographical Survey of the Territories. Geology. 358 Genus INOCERAMUS, Sowerby. INOCERAMUS CRIPSII ? var. SUBUNDATUS. Plate 3, figs. 1,1 a, and 3, 3 a. Inoceramus Ci-iiisii, Mautell (1822), Fossils South Downs, or lUiist. Geol. Susses, 133, pi. xxvii, fig. 11.—? Goldf., Petref. Germ., ii, 116, figs. 4, «, &.—Zittel (1864), Bivalves of the Gosau Formation, tab. xiv, figs. 1 and 2 (varieties and synon. ?). ? Inoceranus Barahtni (part), Morton (1834), Synopsis Org. Rem., 62, pi. 13, fig. 11. Inoceramus subuiHlatus, Meek (1861), Proc. Acad. Nat. S
. Bulletin of the United States Geological and Geographical Survey of the Territories. Geology. 358 Genus INOCERAMUS, Sowerby. INOCERAMUS CRIPSII ? var. SUBUNDATUS. Plate 3, figs. 1,1 a, and 3, 3 a. Inoceramus Ci-iiisii, Mautell (1822), Fossils South Downs, or lUiist. Geol. Susses, 133, pi. xxvii, fig. 11.—? Goldf., Petref. Germ., ii, 116, figs. 4, «, &.—Zittel (1864), Bivalves of the Gosau Formation, tab. xiv, figs. 1 and 2 (varieties and synon. ?). ? Inoceranus Barahtni (part), Morton (1834), Synopsis Org. Rem., 62, pi. 13, fig. 11. Inoceramus subuiHlatus, Meek (1861), Proc. Acad. Nat. Sci. Philad., xiii, 315. * Shell (riglit valve) snbovate or triincato-siibcircular, rather gibbous ; anterior and posterior margins rounding more or less regularly into the base, so as to form with the latter about three-fourths of a circle ; hinge equaling a little more than two-thirds of the entire length of the shell; beak small, rather obtuse near the anterior margin, and rising but slightly above the binge. Surface ornamented by regular concentric undulations, separated by concave spaces of nearly uniform size, and concentric striae. Length, inches; height, inches; convexity of right valve, inch. I have long been greatly at a loss what disposition to make of shells of this type. In Europe, various forms more or less nearly like this are generally referred to I. Cripsii of Mautell, though it has always seemed to me that several of them are distinct from Mantell's type. Yet we in this country, who have never seen Mantell's original speci- men, and only know it from his imperfect figure and very brief descrip- tion, are greatly at a loss in regard to its exact specific limits. The question in regard to the proper name to retain for these shells is also further complicated by the fact that Dr. Morton in this country long back described a species, /. Barahini, that is also generally con- sidered a synonym of I. Cripsii. Morton, however, included two
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