Pohlman [1881, 1882, 1886] published descriptions of the following eurypterids from these rocks at Buffalo:
Pterygotus buffaloensis
Ceratiocaris grandis (=Pterygotus grandis (Pohlman) C. & R.)
Eurypterus giganteus (=E. pustulosus Hall)
Pterygotus globicaudatus (=E. pustulosus Hall)
P. acuticaudatus (=P. buffaloensis)
P. quadraticaudatus (=P. buffaloensis)
P. bilobus Huxley & Salter (=P. buffaloensis)
Eurypterus scorpionis Grote & Pitt (=Dolichopterus macrochirus Hall)
While the splendid collection at Buffalo was being brought together and some part of its treasures made known by the publications referred to, other rocks of this State as well as of adjoining regions were giving evidence of the presence of very remarkable eurypterid remains.
In 1882 Whitfield recorded the occurrence of an Eurypterus in the Siluric waterlime of Ohio, which was fully described as E. eriensis in the Report of the Geological Survey of Ohio, volume 7, 1893, and Walcott announced the discovery of a multispinose eurypterid leg in the Utica slate near Holland Patent, Oneida co., N. Y. The genus Echinognathus was proposed for this new type and the species described as E. clevelandi.
In the same year Prof. D. S. Martin at a meeting of the New York Academy of Sciences reported that he had seen in the State Museum a head shield nearly a foot in length and breadth from the Catskill beds at Andes in Delaware co., N. Y. This was described and figured by Hall the following year as Stylonurus excelsior, a gigantic representative of a genus already known from the Ludlow beds of Scotland. Another carapace of this species from the Catskill beds of Pennsylvania was described the same year by Claypole as Dolichocephala lacoana.
The next year [1884] James Hall described for the Second Geological Survey of Pennsylvania an interesting fauna of eurypterids found in the Productive Coal Measures. The first announcement of a eurypterid of
