Siliceous sponge spicules from the Bellefonte dolomite near Union Furnace, central Pennsylvania, are described and illustrated. The new species, Hyalostelia clinopentactinoides, is described. Hyalostelia Zittel and the genotype, Hyalostelia smithii (Young and Young), from the Carboniferous of Scotland, are briefly discussed. A morphologic classification for siliceous spicules, based with some modifications upon review of previous work, is presented together with illustrations of major spicule types.

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