"Calcareous plates from the upper Bathonian (middle Jurassic) of the Dorset coast, England, doubtfully placed in the Holothuroidea and previously referred to Etheridgella sp., are redescribed as Frizzellus irregularis, n.gen., n.sp. A statistical study of Frizzellus n.gen. (qua 'parataxon') shows it to be a normally distributed coherent unit of a zoological genus within the sections and localities studied."

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