Palaeontology of New-York: Containing descriptions and figures of the organic remains of the lower Helderberg group and the Oriskany sandstone 1855 - 1859 : text, Volume 3, Issue 1
Van Benthuysen, 1859 - 532 pages
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abruptly angles anterior aperture apex appear arms articulations base beak becoming beds body broad cardinal cast centre character closely concentric condition convex curved depressed described direction distinct dorsal valve elevated Enlargement entire equal Eurypterus extending extremity feet figure formations fossils four fragment front genus Geological position gibbous gradually greater growth hinge impressions incurved individual interior joints known larger lateral length less lobe longitudinal Lower Helderberg group margin mesial middle mountains muscular narrow nearly New-York observed opposite original Oriskany sandstone period PLATE plications portion position and locality posterior preceding present preserving Profile prominent radiating referred Report rocks rounded scarcely Schoharie seen separated shaly limestone shell showing shown side similar single sinus slightly sometimes species specimen spire strata striae strong strongly structure SURFACE marked transverse upper usually ventral valve volution wide width young