. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fi(i 560.—Crelosplra concava. Magnifled view of spirals. l07,andPal. N. Y. niferouB Gr. vol. 3, p. 245, Cor- KiG. n,')!.—CoBlosptra dts- pai'llls. Dorsal aud ventral views. dichotoma, IIall, 1859, (Leptoccclia dichotoma,) Pal. N. Y., vol. 3, p. 452, O risk any sandBtone. dispariliB, Hall, 1852, ( A t r y p a disparilis,) Pal. N. Y., vol. 2, p. 277, Niagara Gr. Crania, Retzius, 1781, SchriftenderBerliner Gesellscha
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fi(i 560.—Crelosplra concava. Magnifled view of spirals. l07,andPal. N. Y. niferouB Gr. vol. 3, p. 245, Cor- KiG. n,')!.—CoBlosptra dts- pai'llls. Dorsal aud ventral views. dichotoma, IIall, 1859, (Leptoccclia dichotoma,) Pal. N. Y., vol. 3, p. 452, O risk any sandBtone. dispariliB, Hall, 1852, ( A t r y p a disparilis,) Pal. N. Y., vol. 2, p. 277, Niagara Gr. Crania, Retzius, 1781, SchriftenderBerliner Gesellschaft Naturforschende Freund, vol. 2, p. 72. [Ety. kranion, the upper part of a skull.] Shell circular, subquad- rate, transverse, or elongated, attached by its ventral valve to some foreign object; upper or dorsal valve more or less convex or conical; apex central or subcentral; surface smooth, spiny, radiated, or concentrically lined, and not unfrequently having the markings of the object to which the lower valve is attached; no articulating hinge or ligament, but valves held in place by four muscles; anterior adductor scars approximate and close to the center; posterior pair near the cardinal edge, and widely separated; struc*,ure calca- reous and tubular. Type 0. bratten- Pio. 552. — Crania anomala, 2 dlam. a, Anterior posterior adductors; e, protractor sliding muscles muscle; r, o, retractor sliding acadiensis. Hall, 1860, Can. Nat. and Geo., vol. 5, p. 144, Up. Sil. anna, Spencer, 1884, Bull. No. 1, Mus. Univ. St. Mo., p. 57, Niagara Gr. aurora, Hall, 1863, 16th Rep. N. Y. St. Mus. Nat. Hist., p. 30, Schoharie Grit. 23 bella, Billings, 1874, Pal. Fosb., vol. 2, p. 15, passage beds between Up. Sil. and Devonian, bordeni. Hall & Whitfield, 1872, 24th Rep. N. Y. St. Mus. Nat. Hist, p. 187, Up. Held. Gr. carbonaria, Whitfield, 1882, Desc. New Spec. Foss., from Ohio. p. 229, Coal Meas. corrugata. Hall, 1843, (Orbicula corruga- tu8,) Geo. Rep. N
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