Reviews of the nomenclatural status and related matters on selected non-marine molluscs occurring in the British Islands are provided, and in some cases nomenclatural actions carried out. The most significant points raised are: Paludinella L. Pfeiffer 1841 (Assimineidae) the nominal type species "Helix littorina Delle Chiaie 1828" is recognized as misidentified, and fixed as the species intended by L. Pfeiffer, for which Paludinella globularis (Hanley in Thorpe 1844) is the valid name; Heleobia (Eupaludestrina) Mabille 1877 (Cochliopidae), with type species Hydrobia macei Paladilhe 1867, is a senior subjective synonym of Semisalsa Radoman 1974; Ecrobia ventrosa (Montagu 1803) (Hydrobiidae) is declared nomen protectum, and Turbo eburneus Jacob in Adams & Kanmacher 1798 nomen oblitum; Mercuria manna (Poiret 1801) (Hydrobiidae) is confirmed as the oldest available name for the Mercuria species aggregate; Physidae, the classification is reviewed and the species acuta Draparnaud 1805 is referred to Physella (Acutiana); this species is here designated as type species of Acutiana Fagot 1883; Ferrissia fragilis (Tryon 1863) (Planorbidae: Ancylinae) is accepted as the senior synonym of F. wautieri (Mirolli 1960); Cochlicopa lubricella (Porro 1838) (Cochlicopidae) is not validly proposed by Rossmassler (1834, 1835); relationship to C. lubricoides (Potiez & Michaud 1838), which may have precedence, remains to be clarified; Papillifera papillaris (O.F. Muller 1774) (Clausiliidae): reports of introductions into the British Isles are summarized; Anion (Anion) vulgaris Moquin-Tandon 1855 (Arionidae) proposed to be maintained as the valid name for the invasive species often referred to as A. lusitanicus [not of Mabille 18681; to utilize the name vulgaris as intended, a neotype fixation to be validated by the ICZN is recommended; Trochulus sericeus (O.F. Muller 1774) (Hygromiidae) is probably based on juvenile Monachoides incarnatus (Muller 1774); authorship cannot be attributed to Draparnaud (1801); the current species concept requires fixation by a neotype according to article 75.6 ICZN.
