244 AET. II. A. IZUKA : 



Glycera ononiicJiiensis n. sp. 



PL XXIV, figs. 10—12. 



Body measures 70 — -90 mm. in lengtli, comprising 100 — 140 

 segments. Maximum breacltii at about 40th segment, 5 mm. 

 with parapodia and 4 mm. without them. Segments bi-annulated. 

 General colour of body dark brown, basal region of parapodia 

 being lighter. 



Prostomium conical, more than twice longer than wide, 10- 

 ringed. Tentacles small. Three anteriormost pairs of parapodia 

 without dorsal cirrus. 



Typical parapodium (fig. 10) long, longer than high ; two 

 posterior ligulse separated by a shallow notch, with conical tip ; 

 two anterior ligulce slightly longer than the posterior, with pointed 

 tip ; ventral cirrus large and pointed ; dorsal cirrus situated at 

 base of parapodium ; bristles of two kinds, simple and compound. 

 Gills not found. 



Parapodia become slightly longer towards posterior end of 

 the body; in 105th parapodium (fig. 11) the two posterior ligula3 

 are a little shorter than in the typical one (fig. 10), so that the 

 tips of these two ligulöe and of the ventral cirrus lie in nearly 

 vertical straight line. In those parapodia which lie near posterior 

 end of body, the difference in lengtli between anterior and posterior 

 ligulœ is more marked than in anterior parapodia, so that the 

 distal end of the ventral cirrus lies beyond that of the posterior 

 ligulse. 



Proboscis club-shaped, measuring about 15 mm. in lengtli ; 

 Avith two kinds of papilla) : one small and slender (fig. 12) with 

 obliquely cut end, and the other much larger, conical in form, and 



