358 NEW YORK STATE MUSEUM 
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 
Pterygotus anglicus 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 
tvpe, both features recalling P. bilobus. 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 P. anglicus is quite 
suggestive. Probably with larger collections this species may prove to 
be a vicarious form of the British type. 
Pterygotus buffaloensis (Pohlman) emend. 
Plate 57, figure 3; plates 67, 68, 72-80 
?P. cummingsi Grote & Pitt. Buffalo Soc. Nat. Sci. Bul. 1877. 3: 18, 
fig. I 
P. buffaloensis Pohlman. Jbid. 1881. 4: 17, fig. 1-3 
P.sp. (cummingsi?) Pohlman. Ibid. p. 18, fig. 4 
P.acuticaudatus Pohlman. Ibid. p. 42, pl. 2, fig. 3 
P. quadraticaudatus Pohlman. Ibid. p. 43, pl. 3, fig. 1 
P. ?sp. Pohlman. Jbid. p. 44, pl. 3, fig. 2 
P.macrophthalmus?Pohlman. Ibid. p. 44 
P. buffaloensis Pohlman. Jbid. 1886. 5: 24, pl. 3, fig. 1 
P. bilobus (Huxley & Salter) Pohlman. Jbid. p. 27 
P. buffaloensis, quadraticaudatus,cummingsi Laurie. Roy. Soc. 
Edinburgh Trans. v. 37, pt 2, 1893, p. 515, 517 
P. buffaloensis Semper. Beitr. z. Pal. u. Geol. Oesterr.-Ung. u. d. Orients. 
1898. 11:74 et Seq. 
