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Perioxus Pomel, 1883, p. 49

Distribution	Upper Jurassic (Oxfordian), France
Type	Collyrites censoriensis Cotteau, 1855, p. 262 by monotypy.
Species Included	Only the type species
Classification and/or Status	Stem group Atelostomata (disasteroid) Subjective junior synonym of Metaporinus Agassiz, 1844
Remarks	Lambert & Thiery (1924, p. 395) state that Cotteau's species (on which Pomel based his genus) was based upon a deformed specimen of Metaporinus michelini Agassiz, the type species of Metaporinus. Pomel, A. 1883. Revision methodique et des genera d\'echinides vivants et fossiles. Thesis presentes a la Faculte des Sciences, Paris. Alger, A. Jourdan.