Logan, W. N., 1898, The invertebrates of the Benton, Niobrara, and Fort Pierre Groups, Pt. VIII. IN Williston, S. L., Paleontology, Pt. I (upper Cretaceous).

Logan, W. N., 1898, The invertebrates of the Benton, Niobrara, and Fort Pierre Groups, Pt. VIII. IN Williston, S. L., Paleontology, Pt. I (upper Cretaceous)., Kansas University Geological Survey 4, pp. 431-518

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