The classification of the Scaphopoda proposed by Pilsbry & Sharp (1897-1898) is revised and expanded. The following genera are recognized, Dentaliidae: Prodentalium, Devonian-Permian; Dentalium, Triassic-Recent; Plagioglypta, ?Ordovician, Devonian-Cretaceous; Fustiaria, Triassic-Recent. Siphonodentaliidae: Entalina, ?Triassic, Paleocene-Recent; Pulsellum, Paleocene-Recent; Siphonodentalium, Eocene-Recent; Cadulus, Cretaceous-Recent. Striocadulus is proposed as a new subgenus of Cadulus.

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