Several hundred megaspore specimens of Cretaceous age from the western interior of the United States provide the basis for an emended description of the genus Arcellites and the species A. disciformis. To date this species has been found only in Greenland and the United States; s; in Europe and Australia several other species of this genus are present. The genus Arcellites appears to be restricted to the Lower Cretaceous and the lowermost part of the Upper Cretaceous.--B.S.H

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