. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 464 CEPHALOPODA. [SPI. THK. capRX, Meek A Worthen, 1H66, (Cryf>to- cerM capax,) Froc. Acad. Nat. Sci. Phil., p. 262, and (ieo. Bur. III., vol. 6, p. 632, Coal Meos. colleetiini. Meek & Worthen, 1870, Proc. Acad. Nut. Sci. Phil., p. 48, and Oeo. 8ur. III., vol. 5, p. 544, St. Ix)uiH (Jr. indianense, Worthen, (in prem,) Geo. 8ur. 111., vol. 8, p. 150, St. LouIb (Jr. leidyi, Meek & Worthen, 18(55, (Nautilu
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 464 CEPHALOPODA. [SPI. THK. capRX, Meek A Worthen, 1H66, (Cryf>to- cerM capax,) Froc. Acad. Nat. Sci. Phil., p. 262, and (ieo. Bur. III., vol. 6, p. 632, Coal Meos. colleetiini. Meek & Worthen, 1870, Proc. Acad. Nut. Sci. Phil., p. 48, and Oeo. 8ur. III., vol. 5, p. 544, St. Ix)uiH (Jr. indianense, Worthen, (in prem,) Geo. 8ur. 111., vol. 8, p. 150, St. LouIb (Jr. leidyi, Meek & Worthen, 18(55, (Nautilus leidyl,) Proc. Acad. Nat. Sci. Phil., p. 262, and (ieo. Sur. III., vol. 5, p. 524, Keokuk Gr. Hpringeri, White «& St. John, 1868, (Nau- tiluH Hpringeri,) Trans. Chi. Acad. Sci., vol. 1, p. 124, Up. Coal Meas. Spintln, Lamarck, 1801, Syst. An. sans Vert. mortoni, Troost, 1840,5th (Jeo. Kep. Tenn., Niagara (tr. Not clearly detined. SthkitocekaHj BillingH, 1866, Cutal. Sil. FosH. Antic, p. 88. [Kty. atreplon,tw isted; kerrm, horn.] Having the general lorm of OncocernH, but with a trilobetl a|)er- ture reHemhling Phragnioceras, Type 8. janus. heroH, Hillings, 1866, Cntal. Sil. Fohs. Antic, j). HU, Niagara (Ir. jiinus, Billings, 1866, Cutal. Sil. Fobs. Antic, p. 88, Niagara Fio. 7( Aperture of Streptooerus jauus. 's, McCoy, 1844, Synop. Carb. Fobs. Ireland, p. 20. [Ety. (emno, I di- vide; cheilos, lip.] Nautiloid in form, and characterized by a broad, deep, open umbilicus, showing all the volu- tions, with the outer side of the volu- tions broad or flattened, and the middle of each lateral margin prominently angu- lar ; the angle being sometimes nodose, while the transverse diameter of the volutions is always greater than the dorso-ventrai ; siphuncle between the middle and the outer side of tlie whorls. Type T. biangulatus. coxanum, Meek & Worthen, 1869, Proc. Acad. Nat. Sci. Phil., p. 50, and Geo. Sur. 111., vol. 5. p. 543, St. Louis Gr. latum. Me
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