A new diagnosis is proposed for the crinoid family Rhabdocrinidae with emphasis on the structure of the radial facets. In Rhabdocrinus vatagini Arendt, sp. nov., the plates were probably flexible along their sutures as indicated by the presence of fossae for ligaments or muscles along the connecting surfaces.--P. M. Kier.
A new species is described, Tunguskocrinus ivanovae, representing a new genus and family of the superfamily Homocrinicae. The crinoid was found in Middle Ordovician rocks in Siberia.—P. M. Kier.
