PHOTOGRAPHS OF EURYPTERUS LACUSTRIS
FROM THE LATE SILURIAN STRATA OF NEW YORK STATE
EURYPTERIDS.NET SITE INDEX
ABOVE: Eurypterus lacustris Harlan.  A fine specimen from the Williamsville Waterlime at Buffalo, N.Y. The specimen was collected from about an inch below the contact of Williamsville A with B. The pos- terior of the animal is bent over--in this case upward--and part of the animal may actually have been removed via truncation by the overlying deposition of Williamsville B.  Collection of Samuel J. Ciurca, Jr., Rochester, New York.
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Eurypterus lacustris is known only from the Williamsville Formation of Western New York and the Niagara Peninsula of Ontario, Canada.  Associated fossils are cephalopods, high-spired gastropods, phyllocarids plants, and a variety of other forms.