Hyalostelia smithii (Young and Young) [Lower Carboniferous, Scotland], type species of Hyalostelia Zittel, is redescribed from new topotype material, with discussion of the characters and relationships of the genus Hyalostelia. H. smithii is found to be a true hexactinellid, as held by Hinde (1888) and Finks (1960), not a heteractinellid as supposed by de Laubenfels (1955) [Porifera, in Treatise on Invertebrate Paleontology, Pt. E]. The genus is regarded as allied to Stioderma Finks [type species, S. coscinum, Permian, New Mexico], but not identical with that genus.

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