Proposed use of the plenary powers to place publications by Moore, 1938 (1939) and Yeltysheva, 1956, 1959, 1964, concerning dissociated fossil crinoid remains on the Official Index of Rejected and Invalid Works in Zoological Nomenclature, to suppress 13 generic names based on crinoid stem fragments, and to declare these names available for use in zoological nomenclature as collective groups. Z.N. (S.) 1850