Rugose corals from the Upper Ordovician erratic boulders of Öland

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.