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 occur in other species, as in. They appear to mark the location of a strong muscle or muscle-bearing interior process.

The specimen is supposed to have been derived from the greenish Clinton sandstones in the northern part of Cayuga county, N. Y. and is now in the collection of Cornell University.

Hall. Palaeontology of New York. 1859. 3: 413* pl. 83B, fig. 1

Pohlman. Buffalo Soc. Nat. Sci. Bul. 1883. 4: 41, pl. 2, fig. 1

Pohlman. Ibid. p. 42, pl. 2, fig. 2

Laurie. Roy. Soc. Edinburgh Trans. 1893. v. 37, pt 2, p. 515

Hall based his species upon a single fragmentary and rather poorly preserved carapace, now in the American Museum of Natural History. This, however, is fully competent to show the most characteristic features; the form of the carapace, the position of the lateral eyes and peculiar ornamentation.

More than a score of years later, Pohlman found in the Museum of the Buffalo Society Of Natural Sciences another much better preserved carapace [here reproduced in pl. 23, fig. 1] and he recklessly denoted it as, stating that his species had