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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 157

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[page]156.[/page] Survey of Indiana, 13th Ann. Rept. part II., page 156; and Soleniscus texanus, page 155. Sphaerodoma texanus, Keyes, 1889, Proc. Acad. Nat. Science, Philadelphia page 306. Sphaerodoma ponderosum, Keyes, 1889, see above reference. Shell large sub-globose; spine short; volutions five or six in number increasing rapidly in size from apex to aperture, last one extremely expanded; aperture sub-ovate; outer lip sharp; columella smooth, closing the umbilicus; suture moderately impressed. Surface smooth and unornamented save by a few lines of growth. Geol. Pos. and Loc.-- Coal Measures, Kansas City. Reference.-- Geol. of Missouri, Vol. V., p.213. [underlined]Sphaeroxoma primogenia[/underlined], Conrad, sp. Plate XI. figure 18.
 
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