The female of Enteropsis roscoffensis Chatton & Brément, 1909 (Enteropsinae) is fully redescribed based on a single specimen living in the type ascidian host Dendrodoa grossularia (van Beneden, 1847) collected at the Île de Callot (near Roscoff). The cephalosome has a crown-shaped dorsal cephalic sclerite, which is symmetrical and consists of narrow inner portions (right and left sides not fused medially) and broad outer portions, each with three extensions (1 anterior, 2 posterior). The anus opens as a short longitudinal slit on a rounded protrusion of the dorsal urosome posterior to the genital area. It is thought that these characters are specific for the species. The displacement of the anus (longitudinal slit, variously shaped) to the dorsal side (location varies) of the body is perhaps typical of females of the genus.