Palaeontology of New-York: Containing descriptions and figures of the organic remains of the lower Helderberg group and the Oriskany sandstone 1855 - 1859 : plates, Volume 3, Issue 2
Van Benthuysen, 1861
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Albany aperture apex appearance arms articulations attached base beak body broad broken Cardinal view cast cavity character column concentric convexity developed Dorsal and ventral dorsal valve Dorsal view elevated Enlargement entire exfoliated extended exterior extremity feet figure foramen fragment front views gibbous head imperfect interior joint larger individual larger specimen Lateral view left valve less Lith lobe longitudinal lower side margin marked median medium mesial muscular impression natural nearly ordinary Page Palaeont N.Y. Vol partially peristome plates PLATYCERAs plications portion preceding presenting preserving profile views pygidium radiating removed represented RHYNCHONELLA seen septum Shaly Limestone shell showing shown sinus small individual small specimen smaller ſº species spine spire stone striae strongly structure surface Swinton thorax upper side usual vascular ventral valve ventral views volution wing young individual young specimen