The new genus and species of eurypterid, Brachyopterus stubblefieldi, from lower Caradoc (Ordovician) beds in the Severn river area, Montgomeryshire, central Wales, is described. Classification of eurypterids is also discussed; two new superfamilies, Stylonuracea and Eurypteracea, and two new families, Mycteropteridae and Rhenopteridae, are proposed. Three new names are proposed for preoccupied generic names, as follows: Tarsopterella for Tarsopterus, Onychopterella for Onychopterus, and Tylopterella for Tylopterus.

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