DIECK (1) has studied the anatomy and evolution of Cephalothrix (?) galathae (sp. n. ?), which lives on Galathea strigosa, devouring its eggs; afterwards it takes its abode in the branchial cavity, and perhaps sucks the blood of the gills. The eggs and spermatozoa are evacuated through defined ventral orifices provided with a sort of lid, and the spermatozoa penetrate through these openings to the eggs, which are thus fecundated and partially furrowed while still in the body of the mother. The author compares the method of evolution of this species with that observed in other Nemerteans, and regards the rejection of the first formed vibratile epithelium, in the embryo, as the last vestige of the "Pilidium" metagenesis (or rather metamorphosis) in other species.
