On some New Species of Eurypterus ; with Notes on the Distribution of the Species

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Abstract
T he genus Eurypterus of De Kay, though long known in America* and on the Continent, has attracted but little notice in this country since the time that Dr. Hibbert published his outline-sketches of this strange crustacean, in the ‘Transactions of the Royal Society of Edinburgh’ for 1836 (vol. xiii. pl. 12). His species, by far the largest in the genus, and probably not less than 3 feet long, had been previously noticed, under the name of Idotea , by Dr. Scouler, in the ‘Edinburgh Journal of Natural Sciences’ for 1831. Dr. Harlan too, in his ‘Medical Researches” had given similar, but rather more perfect figures of two species from Williamsville, Buffalo, in the State of New York. All these representations showed that the Eurypterus possessed at least three pairs of appendages, of which the hinder pair wore dilated for swimming. More lately Dr. Ford. Roomer gave a beautiful lithograph of the principal species in Meyer’s ‘Palæontographica’ (vol. i. pl. 27); and Eichwald has since published in the ‘Bulletin of the Imp. Soc. Nat. Moscow’ for 1854 a complete series of illustrations of the Baltic species, E. tetragonophthalmus Fischer, but under the name of E. remipes . The number and character of the appendages are the same in this as in the species previously published by Dr. Harlan. Now that the structure of Pterygotus * is fully understood, and the position of the eyes found to be lateral, and not on the surface of the carapace, it is easy to distinguish that genus from

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