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Parryoceras
''Parryoceras'' is a cyrtogomphoceratid similar to ''Strandoceras'' but with broadly expanded siphuncle segments and a nearly straight ventral line. The mature shell is thickened on the inside just behind the aperture resulting in a constriction in the internal mold at the adoral end. ''Parryoceras'' comes from the middle and upper Ordovician of arctic Canada and Norway. ==References==
*Flower, Rousseau H. and Curt Teichert, 1957; The Cephalopod Order Discosorida, in University of Kansas Paleontological Contributions, Mollusca Article 6, pp 1-144 (plates, figs) July1, 1957. *Curt Teichert 1964. Nautiloidea-Discosorida; Treatise on Invertebrate Paleontology Part K, Endoceratoidea, Actinoceratoidea, Nautiloidea. Geological Society of America.
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