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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 109

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[page]108[/page] [underlined][?Spipenina?] kentuckensis[/underlined], Shunard. Plate VIII. figure 10. Shell small, sub-semicircular in outline, always wider than long, length about three eights of an inch; hinge line equal to greatest breadth of shell, often extended ending in delicate ears. Dorsal valve convex, most convex near the middle, beak incurved, not prominent, hinge area narrow, curving with beak; middle plication enlarged to form the mesial fold. Ventral valve more convex than dorsal, greatest convexity back of middle, beak rather prominent, incurved; hinge area concave, extending to ears; foramen higher than wide; mesial sinus narrow rather deep. Surface marked by rather large plications, there being from five to eight on each side of fold and
 
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