. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Cyclonema bilix. {Pleurotomaria lilix.) Rogers, page lift .A ^^^' fig. "620. Loraine formation. (Conrad, ^ ^^ Jour. Acad. N. Sci. Phila. Vol. 8, 1842. Tren- ton and Hudson river formations ) IIc^ Illh^— The genus Cyclonema (thread-wound) was es- tablished by Hall in Pal. N. Y., Vol. 2, 1852, R. SZO page 89; Ulix being its type species. Cyclonema cancellatum. {littorina cancellata.) Hall, GeoL, 1843, page 72, figs. 17, 5, a young individual fine
. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Cyclonema bilix. {Pleurotomaria lilix.) Rogers, page lift .A ^^^' fig. "620. Loraine formation. (Conrad, ^ ^^ Jour. Acad. N. Sci. Phila. Vol. 8, 1842. Tren- ton and Hudson river formations ) IIc^ Illh^— The genus Cyclonema (thread-wound) was es- tablished by Hall in Pal. N. Y., Vol. 2, 1852, R. SZO page 89; Ulix being its type species. Cyclonema cancellatum. {littorina cancellata.) Hall, GeoL, 1843, page 72, figs. 17, 5, a young individual finely and beautifully can- cellated over its whole surface. This marking became obliterated as the animal grew old, see figs. 6, front and back views. Abundant in the Sodus and Rochester green (Clinton) shale ; also in the Rochester and Medina Pentamerris strata.— Va. Cyclonema concinnum ( Concinna), See Appendix. Cyclonema hamiltoniae. See Appendix. Cyclonema leavenworthana. {Pleurotomaria leaven- yj ^' worthana^ Hall, Trans. Alb. Ins. Vol. ^ •"" "^^ 4, 1856.—Whitfield, Bull. 3, Am. Mus. N. H. 1882, plate 8.) Collett's Indiana Rt. 1882, page 363, plate 31, figs. 29, magniiied twice ; fig. 30, natural size ; In^. /DsT. P/.3/T'^^^ fig. 31, magniiied twice and showing opening to chamber.—Suhcarh. limestone at Alton, 111., and Spergen Hill, Lanesville and Bloomsburg, Ind. This shell varies its form greatly with age, the young being rounder, the old with longer spires. It is not a Pleurotom,aria, nor a Murcli- isonia, because it has no special spiral band. It is near Pleti- rotomaria trilineata. ^I Cyclonema percarinatum. {Pleurotomaria percarinata. Hall, Pal. N. Y. Vol. 1, 1847, Trenton and Hudson river groups.) Emmons, Amer. Geol. I, ii, page 223, plate 5, fig. 7 ; like other gas- teropods (snails) of the Trenton limestone at Middleville, N. Y., rarely smooth and perfect; therefore hard to identify; associated with Atrypa hemiplicata., Cyrtolites compressus^
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