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 132

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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 132

[page]131.[/page]

[underlined][underlined]Anatinidae.[/underlined][/underlined]

[underlined]Alloriema subcuneata[/underlined], M. and H.

Plate X. figure 5.
Meek and Hayden, 1858, Proceed. Acad. Nat. Sci. Philadelphia, p.263.
Allorisma ensiformis, Swallow, 1860, Trans. St. Louis Acad. Sci. Vol. XI, p.653.
     Shell very large in adult specimens, length between four and five inches, height about two inches, thickness slightly less than height; bi-convex, greatest convexity near the umbos; equivalve. Hinge margin straight or nearly so, posterior margin curved, posterior extremity gaping; basal margin curved posteriorly, nearly straight along the middle where it is approximately parallel to the hinge; in front it passes abruptly into the anterior margin. Umbos projecting above the hinge line;

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[page]131.[/page] [underlined][underlined]Anatinidae.[/underlined][/underlined] [underlined]Alloriema subcuneata[/underlined], M. and H. Plate X. figure 5. Meek and Hayden, 1858, Proceed. Acad. Nat. Sci. Philadelphia, p.263. Allorisma ensiformis, Swallow, 1860, Trans. St. Louis Acad. Sci. Vol. XI, p.653. Shell very large in adult specimens, length between four and five inches, height about two inches, thickness slightly less than height; bi-convex, greatest convexity near the umbos; equivalve. Hinge margin straight or nearly so, posterior margin curved, posterior extremity gaping; basal margin curved posteriorly, nearly straight along the middle where it is approximately parallel to the hinge; in front it passes abruptly into the anterior margin. Umbos projecting above the hinge line;