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 75

Transcribe
Translate

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 75

[page]74.[/page]

Syn. Orthiena crassa, Meek and Hayden, 1858 Proc. Acad. Nat. Sci. Philad., p. 260.
Orthic Paeallensis, McChesney, 1860, New. Paleozoic Fossils, p. 32.
Orthic richmondi, McChesney, same as above.
Hemipronites crassus, Meek and Layden, 1864. Paleont. Upper Missouri p. 26.
Hemipronites Cassallensis, McChesney, 1867. Trans. Chicago. Acad. Sci., Vol. I, p. 28.
Derbya crassa, Hall, 1892, Paleont. of New York. Vol. VIII., Part I. p 261.
     
     Shell varying in size from five-eights to one and three fourths inches wide and from one half and one half inches long, plano convex or concavo convex; sub-quadrate or semi-elliptical.
     Dorsal valve, convex greatest convexity generally a little to the rear of the middle; beak rudimentary or absent; hinge area linear. Interiorly

Saving...

[page]74.[/page] Syn. Orthiena crassa, Meek and Hayden, 1858 Proc. Acad. Nat. Sci. Philad., p. 260. Orthic Paeallensis, McChesney, 1860, New. Paleozoic Fossils, p. 32. Orthic richmondi, McChesney, same as above. Hemipronites crassus, Meek and Layden, 1864. Paleont. Upper Missouri p. 26. Hemipronites Cassallensis, McChesney, 1867. Trans. Chicago. Acad. Sci., Vol. I, p. 28. Derbya crassa, Hall, 1892, Paleont. of New York. Vol. VIII., Part I. p 261. Shell varying in size from five-eights to one and three fourths inches wide and from one half and one half inches long, plano convex or concavo convex; sub-quadrate or semi-elliptical. Dorsal valve, convex greatest convexity generally a little to the rear of the middle; beak rudimentary or absent; hinge area linear. Interiorly