Author: Schindewolf, O.H., 1934.:
Title: Zur Stammesgeschichte der Cephalopoden.
Description: Jahrb. Preuss. Geol. Landesanst., 55: pp. 258-283,[8], 38 figs. on 4 pls., 7 figs. in text, refs. Large 8vo. Wrs.

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