Paracarcinosoma scorpionis
Eurypterids.net
CARCINOSOMATIDS
ABOVE: Paracarcinosoma scorpionis, a fine specimen from the Williamsville Waterlime of upstate New York.  Only the carapace and two attached tergites are preserved in this specimen. See Clarke and Ruedemann (1912) for a wonderful restoration of this fantastic Late Silurian eurypterid.  Paracarcinosoma probably reached a length of at least 1 meter.
Carcinosomatids, among the eurypterids, represent a special group.  Their bizarre appearance, somewhat trapazoidal carapace with forwardly placed eyes and very spiny legs would seem to indicate that carcinosomatids were predators.  Then there is the telson, at least as known in Paracarcinosoma scorpionis - it is a curved spine with a very sharp point - scorpionlike and generally interpreted to carry poison like modern scorpions.  Currently there are 4 genera: Paracarcinosoma, Carcinosoma, Rhinocarcinosoma and an Ordovician form known as Eocarcinosoma (associated with the really bizarre Megalograptus of southwestern Ohio). While, perhaps, rarely encountered, the carcinosomatids are widespread in occurrence.        Paracarcinosoma scorpionis, for example, occurs in the Late Silurian
rocks of the Bertie Group from Central New York (Syracuse) westward into Ontario, Canada (at least as far westward as Byng). A carcinosomatid has also been found at the Maumee Quarry in Ohio in rocks of the Greenfield Formation. The Kokomo Formation of Indiana has yielded
Carcinosoma of great size (see Clarke & Ruedemann, 1912).
BELOW: Paracarcinosoma scorpionis, a prosoma from the Williamsville Waterlime Member of the Bertie Group at the RQS, a quarry on the Niarara Peninsula, Ontario, Canada. Even though the specimen is well-preserved, note the abundant, fragmentary remains surrounding the prosoma. These have been transported into the region along with this specimen.
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BELOW, PHOTOGRAPHS FROM THE COLLECTION OF SAMUEL J. CIURCA, JR. - 1979 -
ROCHESTER, NEW YORK
ABOVE LEFT: One of the spiny legs preserved in fine-grained dolostone, ie. Williamsville Waterlime Member of the Bertie Group, East Victor, New York.  ABOVE RIGHT: A great specimen showing the posterior portion with the, presumably, poison-bearing curved telson.  From a glacial erratic, a large block of Williamsville Waterlime carried slightly south of the outcrop belt to the Lovers Lane Quarry near Manchester, New York.  Both specimens in the collection of the author.
ALSO Paracarcinosoma 2