Two compound corals from the Tretaspis beds of the Oslo-Asker District

Two new species of compound corals - Cyathophylloides kiaeri and Propora askerensis- are described from zone 4cfJ (Tretaspis Series, Upper Ordovician) of the Oslo-Asker District. They show affinity to the uppermost Ashgillian coral faunas of the Oslo region, and that of the Caradocian Kalstad Limestone (Trondheim Region), but are not related to corals found in the Caradocian of the Oslo Region. The growth zonation in P. askerensis is not biologically equivalent to the zonal crowding of tabulae interpreted as annua! growth-lines in many recent and fossil corals.