Identifier: reportofgeolog4121877unit (find matches)
Title: Report of the Geological exploration of the fortieth parallel
Year: 1870 (1870s)
Authors: United States Geological Exploration of the Fortieth Parallel (1867-1881) King, Clarence, 1842-1901 Hague, A. (Arnold), 1840-1917 Emmons, Samuel Franklin, 1841-1911 Hague, James D. (James Duncan), 1836-1908 Meek, F. B. (Fielding Bradford), 1817-1876 Hall, James, 1811-1898 Whitfield, Robert Parr, 1828-1910 Ridgway, Robert, 1850-1929 Watson, Sereno, 1826-1892 Eaton, Daniel Cady, 1834-1895 Bien, Julius, 1826-1909
Subjects: Geology Mines and mineral resources Paleontology Botany Birds
Publisher: (Washington : Govt. Print. Off.)
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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or view ; the shell heing turned so as to show the irregularity of the costse on the anterior slope.4 a. A side view. .* 4 6. A ventral view. Fig. 5. PuODtlCTUS SEMIRETICULATUS. ~ 69 5. View of ventral valvo. / v o «. SFig. 6. Productus -Iveoi? v. 67 6. An oblique side view of a large specimen distorted by pressure. 6 a. A ventral view of another specimen, with its ears and margins broken away. 6 b. Anexternal cast of the dorsal valve, with some portions of the shell remaining near the cardinal margin, showing the thick marginal ridge, and a part of the cardinal process, with the small mesial ridge, which latter is divided near the cardinal pro-cess, as in P. scahriculus. Fig. 7. Productus Prattenianus 72 7. A ventral view of an imperfect specimen, with the ears and free margins broken away. 7 a. A side view of another imperfect specimen. Fig. 8. Productus semistriatus 74 8. An autero-ventral view. 8 a. A side view of same. IT. S. GeoIEzDl.40ParsLllel CarboTuferoLis Plate W.
Text Appearing After Image:
mli^i^ fi-A. tliiott dei J, J3ien nth.. )?»LA.TE VIII. Page.Fig. 1. Spirifekina pulchra 85 1. Dorsal view of the original typical specimen,la.Ventral view of same. 16. An outline profile of same. 1 c. Au internal cast of the ventral valve, showing the slit left by the rostral septum. 1 d. A dorsal view of another very gibbous specimen. 1 e. Au outline profile of same. Fig. 2. Productus Nevadhnsis 64 2. Ventral view of a specimen, with the ears broken away. 2 a. Cast of the exterior of a ventral valve of same species. 2 6. Ventral aspect of another specimen, turned so as to give a more direct view than tig. 2.2 c. Internal cast of ventral valve. 2 rf. A side view of same. 2e. A longitudinal section of a specimen with the valves united. Fig. 3. PHODUCTUS MULTISTRIATUS 76 3. Ventral view of a rather large specimen, with the free margins broken away. 3 a. Side view of same. 3 6. Ventral view of a smaller specimen, with one ear and much of the margins broken away.3 c. Dorsal view of last.

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