Roule starts his paper with: "This Oligochaete has a very specialized habitat: it lives on the rocks at the water's edge which surround Fort Saint-Jean, in the Old Port of Marseille. It was found there by Professor Marion, who mentioned it, without giving it any name, in several of his Memoirs; it was described by M. R. Saint-Loup, who placed it in the genus Pachydrilus {P. enchytraeoides. Comptes rendus, 1885). In reality, this Oligochaete, although very close to the Pachydrilus, differs from it by a less complex circulatory system and by lobed testicles gathered in irregular masses; from this last point of view, as M. Saint-Loup has remarked, it resembles the Enchytraeus. Also, keeping the specific name which has the advantage of specifying the affinities of this Annelid, I propose to call it Enchytroeoides Marioni".