This paper deals with three species of Protogamase!lus (fam. Ascidae) collected at Carnsore Point, Co. Wexford, Ireland and discusses, with re-descriptions, the species of the genus described by ATHIAS-HENRIOT (1961) from Algeria. Protogamasellus primitivus Karg, 1962, the type of the genus, is considered to be a junior synonym of Protogamasellus mica Athias, 1961. Protogamase!lus hibernicus sp. nov. is described from sbil in a grassland/dune area at Carnsore Point, and the following new combin,ations are presented: Protogamasellus minor for Gamasellodes minor Athias, 196 1 and Protogamase!lus minor singularis for Leioseius singularis Karg, 1962. The genus is considered to comprise two distinct groups of species which are characterised. A key is provided for the identification of females occurring in Europe and Africa.