Additional specimens of Erieopterus pustulosus (Hall), a peculiar eurypterid from the Bertie formation of western New York, are described. This new morphological evidence results in the proposal of a new genus, Buffalopterus. A new species of Buffalopterus is also described from the Ordovician of New York, and a new species of Carcinosoma is describe from the well-known Lower Vernon Pittsford) fauna of western New York.

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