Late Ordovician Bryozoa from Ringerike, Norway

This paper comprises a description of the bryozoan fauna from etage 5b (late Ordovician) of Ringerike, southern Norway. Bryozoa form an important part of the rock in this area where they are common both as species and individuals, though they have been much neglected in previous studies. A few preliminary identifications were made by Kiær in his papers on etage 5 of Ringerike (1897, 1902), but these are not reliable.