Fig. 21. Ancistroceras barrandei Dewitz, 1880 from the Upper Grey Orthoceratite Limestone. A in Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician)

Fig. 21. Ancistroceras barrandei Dewitz, 1880 from the Upper Grey Orthoceratite Limestone. A. Specimen MB.C.30518 (Neben & Krueger Coll.) from Rerik (Ostsee); previously figured by Neben & Krueger (1971: pl. 17 fig. 1). B. Specimen MB.C.30516 (Neben & Krueger Coll.) from Rerik (Ostsee). C. Specimen MB.C.11991 (Helms 1966 Coll.) from Gross Zicker (Island of Rügen). Scale bar units = 1 mm.