CRINOIDS FROM THE UPPER ASHGILL (UPPER ORDOVICIAN) OF WALES

A collection of small crinoids and crinoid debris from the Ashgill (Ra wtheyan?) of Cnwce, near St. Clears, Dyfed, southwest Wales includes n umerous crowns of Aithriocrinus strahani n. gen. and sp. incertae fami liae, an indeterminate 10-armed camerate(?) and an indeterminate multi ple-armed camerate. Aithriocrinus strahani was previously considered t o be a cincinnaticrinid, but it is undoubtedly dicyclic and therefore a cladid. This is the only diverse fauna of complete crinoids known fr om the Welsh Ashgill. The monobathrid camerate Xenocrinus S. A. Miller is easily recognized from its disarticulated columnals, which are squ are in outline. Xenocrinus columnals are now recognized from three Hir nantian localities in Wales. Xenocrinus became extinct during the Hirn antian and not at the Rawtheyan-Hirnantian boundary, as has been sugge sted on the basis of crown material.