DIY History | Transcribe | Scholarship at Iowa | 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 94

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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 94

[page]93[/page]

ins, Schlotheim, Nachtr. zur Petref., II.
Productus punctatus, J. Sowerby, 1822, Min-Conch., p.22 P. semipunctatus, Shephard, 1838, Am. Jour. Sci., Vol. XXXIV. Producta punctata, Phillips, 1836, Geol. Yorkshire. Leptaena [?inleata?], Fischer, 1837, Oryct. Mosc. Productus concentricus, Potiez et Michaud, 1814. P. tubulospinus, McChesney, 1860, Desc. New Pal. Fossils, page 37.
     Shell large, thin, sub-oval or sub-triangular in outline, attaining a length of three to three and a half inches sometimes longer than wide sometimes the several; hinge line always shorter than greatest breadth; front regularly rounded, ears small, compressed. Dorsal valve not very deeply concave, mesial fold small.
     Ventral valve convex, greatest convexity in umbonal region, umbo sharply incurved with beak curved over hinge line; surface of valve descending

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[page]93[/page] ins, Schlotheim, Nachtr. zur Petref., II. Productus punctatus, J. Sowerby, 1822, Min-Conch., p.22 P. semipunctatus, Shephard, 1838, Am. Jour. Sci., Vol. XXXIV. Producta punctata, Phillips, 1836, Geol. Yorkshire. Leptaena [?inleata?], Fischer, 1837, Oryct. Mosc. Productus concentricus, Potiez et Michaud, 1814. P. tubulospinus, McChesney, 1860, Desc. New Pal. Fossils, page 37. Shell large, thin, sub-oval or sub-triangular in outline, attaining a length of three to three and a half inches sometimes longer than wide sometimes the several; hinge line always shorter than greatest breadth; front regularly rounded, ears small, compressed. Dorsal valve not very deeply concave, mesial fold small. Ventral valve convex, greatest convexity in umbonal region, umbo sharply incurved with beak curved over hinge line; surface of valve descending