A new echinoderm genus, Mooreocrinus, is proposed to embrace those forms of Cromyocrinus having more than five arms. Species of Carboniferous age from Russia, Scotland and the United States are referred to it. Another new genus, Ureocrinus, is proposed to embrace Permian and Carboniferous cromyocrinids from Great Britain, Scotland, Russia, India, Timor, and the United States possessing five arms and variations in anal area and shape of cups from the ten-armed genus Ulacrinus.

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