154 



I. IJIMA AN'I) T. KAIiURAK I . 



separated from each other by a space somewhat longer than the distance 

 of cither eye from lateral body margin of the same side. 



Mouth opening somewhat behind the beginning of the posterior third 

 of body. Pharynx extending posteriorly from about the end of the anterior 

 third of body, somewhat longer than one-third the body-length. Anterior 

 gut trunk provided with 7 or 8 pairs of branches ; posterior gut trunks with 

 14-18 outwardly directed branches. 



Genital aperture at a distance behind mouth equal to about one-fifth 

 that between the latter and the posterior body-end. Genital atrium divided 

 into penis sheath and vestibulum by a constriction. Testes extremely 

 numerous, spherical, dorsally situated in two lateral zones beginning from 

 ovarian region and extending behind nearly to end of body. Vasa 

 deferentia united into a slender ejaculatory duct in the bulbous part of 

 penis ; without vesicula seminalis. Penis comparatively small, conical, 

 vertical. Ovaries two, situated ventrally between first and second branches 

 of anterior gut trunk. Oviducts opening directly into a small outbulging 

 of vagina at the postero-inferior aspect. Receptaculum seminis large, 

 spherical, situated behind penis. Vagina running anteriorly and obliquely 

 downward to join vestibulum from behind. 



The species is apparently very closely related to Pr. ulvce (Oersted), 

 but differs from it in the absence of pigments and in the oviducts opening 

 directly into the vaginal outbulging, instead of after uniting into an unpaired 

 terminal duct. 



Locality : — Beneath stones on the beach between Yukanki and Meleya 

 in Saghalin. Ijima coll., July 1906. 



2. JProcerodes frigonocephala, n. sp. 



Woodcuts 3 and 4. 



Anterior end triangular, without tentacles. Trunk gradually widening 

 behind, broadest in the region of genital organs, then tapering to the 

 posterior body-end which is somewhat rounded or obtusely pointed. 



