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n.1.(Zool.) An orthoceras; also, any fossil shell allied to Orthoceras.
References in periodicals archive ?
an Orthoceratite in black marble, Duke of D, [pounds sterling]2, 7 Feb.
Striking similarities in lithologies and conodont faunas between the Ordovician Pagoda Limestone of the Yangtze Block in China and the Orthoceratite Limestone in Baltica (Lindstrom et al.
Telephina bicuspis is the most common species of Telephina from geschiebe of the Upper Grey Orthoceratite Limestone, which belong to the Lasnamagi Stage ([C.