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 124

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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 124

[page]123.[/page]

extremity truncated and gaping. The hinge is toothless; there is an elongated, ligamental groove. Shell generally very much elongated as in Pinna peracuta, Shumard.

[underlined][underlined][underlined]ARCACEA[/underlined][/underlined][/underlined]
     In this order the mantle lobes are completely seperate [separate?], or may form two respiratory siphons; the foot is grooved, there are two adductor muscles; the shell is usually equivalve; both valves furnish the hinge with a series of equal teeth.

[underlined][underlined]Nuculidae.[/underlined][/underlined]

[underlined]Nucula ventricosa[/underlined], Hall.
Plate IX. figure 6.
Hall, 1858, Geology of Iowa, Vol. I., Part II., p.716.
     Shell small, thick; sub-ovate, very ventricose, the greatest convexity near usually a little anterior to the middle; dorsal

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[page]123.[/page] extremity truncated and gaping. The hinge is toothless; there is an elongated, ligamental groove. Shell generally very much elongated as in Pinna peracuta, Shumard. [underlined][underlined][underlined]ARCACEA[/underlined][/underlined][/underlined] In this order the mantle lobes are completely seperate [separate?], or may form two respiratory siphons; the foot is grooved, there are two adductor muscles; the shell is usually equivalve; both valves furnish the hinge with a series of equal teeth. [underlined][underlined]Nuculidae.[/underlined][/underlined] [underlined]Nucula ventricosa[/underlined], Hall. Plate IX. figure 6. Hall, 1858, Geology of Iowa, Vol. I., Part II., p.716. Shell small, thick; sub-ovate, very ventricose, the greatest convexity near usually a little anterior to the middle; dorsal