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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 65

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64. [underlined]Erisocrinus typus[/underlined], Meek and Worthen, Plate XII figure 9. Meek and Worthen, 1865, Am. Jour. Science. Vol. XXIX, p.174. Philocrinus pelvis, M. and W., 1865, Am. Jour. Science, Vol. XXIX, p.350. Erisocrinus nebrascensis, M. and W., 1865, Am. Jour. Sci. Vol. XXIX, p.174. Body hemispherical, five parted composed of thick smooth, convex plates. Basal plates small, nearly half of each being hidden by the articulation of the column usually impressed, pentagonal in form. Sub-radial plates three or four times as large as basal plates, equal, hexagonal. First radials about four times larger than sub-radials, not so long as wide, equal pentagonal, upper border broad turning inward at right angles to rest of plate, second radials
 
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