Fifty-seven species of Radiolaria, 55 of them new, distributed among 11 genera, 8 of them new, are described from 3 calcareous concretions of the Upper Devonian Huron Member of the Ohio Shale. Of these, 5 are spumelline forms and 2 are interpreted as primitive cyrtellarians. Five species are doubtfully assigned to the Paleozoic family Albaillellidae Deflandre, 1952, and 5 are classed incertae sedis. This material, because of its unusually fine preservation, partially elucidates the ancestry of later Radiolaria.

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