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Hall. 2d Geol. Sur. Penn. Rep't PPP. 1884. p. 30, pl. 3, fig. 1

Hall & Clarke. Palaeontology of New York. 1888. 7: 157, pl. 27, fig. 5

Beecher. American Journal of Science. 1900. 10:148

We have nothing to add to the elaborate original description of this form, since no other specimens than the holotype are known. As the