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 series, however, not being sharply separated, and the larger series being surpassed by one tooth of much greater dimensions. The coxa indicates a large specimen; its manducatory edge is 38 mm long and bears a series of 13 stout, blunt teeth. The other specimen is probably a fragment of the posterior half of the metastoma, with its counterpart, showing the characteristic semicircular scales of Pterygotus.

These fragments point to a species of considerable dimensions, and all bear a distinct similarity to the corresponding parts of the giant  of the British Old Red sandstone. There is still a differential element present in the regular tapering of the chela and the presence of a greater number of smaller teeth in the American type, both features recalling. As the Devonic beds at Campbellton are believed to correspond in their facies and age to the Old Red sandstone of Europe, the similarity with  is quite suggestive. Probably with larger collections this species may prove to be a vicarious form of the British type.

? Grote & Pitt. Buffalo Soc. Nat. Sci. Bul. 1877. 3: 18, fig. 1

Pohlman. Ibid. 1881. 4: 17, fig. 1–3

sp. Pohlman. Ibid. p. 18, fig. 4

Pohlman. Ibid. p. 42, pl. 2, fig. 3

Pohlman. Ibid. p. 43, pl. 3, fig. 1

?sp. Pohlman. Ibid. p. 44, pl. 3, fig. 2

Pohlman. Ibid. p. 44

Pohlman. Ibid. 1886. 5: 24, pl. 3, fig. 1

(Huxley & Salter) Pohlman. Ibid. p. 27

,,   Laurie. Roy. Soc. Edinburgh Trans. v. 37, pt 2, 1893, p. 515, 517

Semper. Beitr. z. Pal. u. Geol. Oesterr.-Ung. u. d. Orients. 1898. 11:74 et seq.