New data on Rhipidocystis Jkl (Order Digitata n.o., Class Carpoidea Jkl) and on a new genus Bockia (subclass Eocrinoidea Jkl, class Crinoidea Mill.) from the Ordovician of Leningrad Province, U.S.S.R., and Estonia. CR Acad Sci Moscou, 19 1938: pp. 421-424. dviciidi [Zoological Record Volume 75]