Pelmatozoan Columnals from the Ordovician of the British Isles

Abstract

In part 2, 8 genera (3 new) and 9 species (5 new) of crinoid, and 10 morphogenera (7 new) and 33 morphospecies (all new) of pelmatozoan columnal are described. Columnals with 2-, 3-, 4- and 6-fold symmetry form a distinctive component of the Ordovician fauna of the British Isles but are common only locally. Columnals with cyclic symmetry are particularly common, and range from Arenig to Ashgill.