Bryozoa from the Ordovician erratic boulders of Poland

Ordovician bryozoans from erratic boulders of Poland are described. They represent three orders: Cyclostomata, Trepostomata and Cryptostomata. 10 families, 22 genera and 34 species have been identified. Out of these, 1 genus, 1 subgenus and 10 species are new to science. The age and the stratigraphic and geographical distribution of the forms under consideration are discussed