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 Kansas1898Snippet view
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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...