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Books Books 1 - 4 of 4 on Shell compressed-discoidal, wi th umbilicus apparently nearly or quite twice as wide....  
" Shell compressed-discoidal, wi th umbilicus apparently nearly or quite twice as wide as the outer whorl ; volutions very narrow, with dorso-ventral and transverse diameters equal, and section subquadrangular, those within scarcely one-sixth embraced by... "
The University Geological Survey of Kansas - Page 467
1898 - 594 pages
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The Colorado Formation and Its Invertebrate Fauna, Volume 8, Issue 106

Timothy William Stanton - Geology, Stratigraphic - 1893 - 288 pages
...US Geol. Sur. Terr., vol. Ix, p. 449, PI. 6, Figs. 3a, c and 66. " Shell compressed-discoidal, with umbilicus apparently nearly or quite twice as wide...as to extend from near the umbilical margin about halfway across the sides, while the outer near the peripheral margin are more prominent, rounded, and...
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Bulletin - United States Geological Survey, Issues 103-110

Geological Survey (U.S.) - Geology - 1893
...Geol. Sur. Torr., vol.ix, p. 4-10, PI. 6, Figs. За, с and Oft. "Shell compressed-discoidal, with umbilicus apparently nearly or quite twice as wide as the outer whorl; volutions very narrow, with dorso- vent ral and transverse diameters equal, and section ¿mbquadrangular, those within scarcely...
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Reports, Volume 4

Kansas Geological Survey - Geology - 1898
...Stanton, 1892, Bull. US Geol. Surv., p. 179, pi. XLIII, ff. 1, 2. " Shell compressed-discoidal, with umbilicus apparently nearly or quite twice as wide...scarcely one-sixth embraced by the succeeding turn ; cost;L> each mainly represented by two nodes, the inner of which is low, compressed, and elongated...
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United States Geological Survey Professional Paper

Geology - 1927
...471, pi. 103, figs. 1, 2. Meek's original description is as follows: Shell compressed-discoidal, with umbilicus apparently nearly or quite twice as wide...with dorsoventral and transverse diameters equal, and » Idem, p. 217, pi. 45, figs. 1, 2. » Meek, FB, Invertebrate Cretaceous and Tertiary fossils of the...
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