Some notes on the genus Dolichopterus Hall

An exceptionally well-preserved eurypterid operculum ("type A") from the classic Upper Silurian "Bertie" waterlime of Jerusalem Hill, Herkimer County, New York, proves to be specifically new: Dolichopterus jewetti Caster and Kjellesvig-Waering. The operculum establishes the presence of three pairs of lateral plates united by sutures. The presence of the proximal pair of opercular plates had not been previously established. A new European eurypterid species from the famous Oesel Silurian beds is named Dolichopterus stoermeri and another form from the "Bertie" waterlime of New York is designated as Dolichopterus herkimerensis.