The genus Dixonia is proposed for those small echinoids with 5 genital pores that have been referred to Discodea Gray 1825. The type species of Dixonia is Discoidea dixoni Forbes in Dixon, 1850. Discoidea minima Agassiz 1840; D. infera Agassiz and Desor 1847 and D. archiaci Cotteau 1861 may be referred to the new genus. Discoidea Agassiz 1835 is an unjustified emendation of Discodea Gray 1825.

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