THE EURYPTERIDA OF NEW YORK 357 
presence of Pterygotus remains in the Gaspé sandstone, though these 
were described by Dawson as plants of the genus Selaginites [op. cit. 
p. 399]. Remains of Pterygotus have also been found in the lower marine 
Devonic Dalhousie beds of Dalhousie, N. B., in fragments which appear 
to have been washed seaward of their proper sites. Near Campbellton, 
_N.B., in indurated limestones containing fish remains of probable Upper 
Devonic age, are also such remains, which were first noted by Whiteaves 
when describing the fish fauna of this locality. 
Fragments, presumably of Pterygotus, have been reported from the 
Lower Devonic'of the Knoydart formation, Arisaig, Nova Scotia, where they 
are associated with fish remains of the genus Pteraspis and Cephalaspis.’ 
All of the occurrences referred to have been more or less particularly 
noticed by Clarke in Early. Devonic History of New York and Eastern North 
America, but only that at Campbellton has furnished material adequate 
for description. This original material consists of a suite of three 
specimens, now in the Victoria Memorial Museum at Ottawa. These 
are a free chela, the coxa of a swimming leg and a small portion 
of a metastoma bearing traces of ornamentation. The chela is of 
slender form, straight, tapering regularly to the apex which is not pre- 
served. The length is 50 mm, its proximal width, not counting the 
articulating process, is 9 mm, its distal width, at the point of fracture, 
about 3 mm. The ramus is but little compressed, its section irregular 
and convex, the greatest thickness being near the inner edge, whence the 
ramus abruptly narrows down to the dentate edge, and more gradually 
to the outer edge. The teeth are in two series, one of more numerous 
small sharp points, and one of larger distinctly furrowed teeth, the two 
‘The Knoydart formation, so named by Ami, is regarded by Fletcher as of Upper 
Devonic age. On the basis of ‘the fish remains Dr Smith Woodward correlated these 
sandstones with the Lower Devonic Hereford beds. Further investigation will be 
required to fix their relation to the fish beds of Campbellton, N. B., and Migouasha, 
Quebec, which are now regarded as of later Devonic age. 
*See Ami. Geolog, Soc. America Bul. 12: 301-12. 1901; Twenhofel. American 
Journal of Science, Aug. 1909; Williams, M. Y., Geol. Surv. Canada Rep’t, rorr, p. 244. 
