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Abstract
The rugose corals from the Upper Ordovician glacial erratic boulders containing the Hulterstad Fauna are described and illustrated. The following species are recorded: Rectigrewingkia anthelion (Dybowski, 1873), Streptelasma cf. primum (Wedekind, 1927) and Streptelasma medioseptatum n.sp. The taxonomy and ontogeny of these species and genera are discussed.