EKEANTIATE TOLYCHAETA OF JAPAN. 191 



Peristomium, which almost completely covers the prostomiiim, 

 bears 2 somewhat club-shaped tentacular cirri on each side ; the 

 dorsally situated tentacular cirrus longer than the median ten- 

 tacle by nearly half the length of the latter ; the ventrally situated 

 cirrus somewhat shorter. 



Segments short ; their breadth on the ventral surface in the 

 middle parts of l)ody about six times the length of the segment. 



Parapodium well- developed, longer than high ; anterior lip 

 roundisli, extending beyond the more conical posterior lip ; dorsal 

 cirrus arising from a short distance above parapodium, indistinctly 

 annulated. 



Bristles of falcate kind with bifid tip ; about 15 in a bundle. 

 Superiorly placed bristles with long and slender end-piece ; the 

 middle ones with short (fig. 10), and the inferiorly placed ones 

 with still shorter and broader (fig. 9), end -piece. 



A'entral cirrus thick and cylindrical in form, not reaching to 

 tijj of the posterior lip of parapodium. 



Pharynx 1 mm. in length, with 14 papillae. Proventriculus 

 2.25 mm. in lengtli, with about 37 glands. Posterior to the latter 

 are afiixcd two T-sliapcd glands. 



Habitat : — Jögashima near Misaki ; " South Japan "' (Maeex- 



ZELLEIl). 



Family Hesionidae. 



Prostomiiim with hvo pairs of eyes, two or tlu'ee ten- 

 tacles, and gciu'ially hvo Itiarticulated palpi. Body of moderate 

 length. Pygi<liiiiii with two anal cirri. Proboscis protrusible, 

 armed nr muinncd. Anterior segments (I — 4) distinct or more or 

 less fused, cadi cai'iyiiig two pairs of tentacular cirri. ïlie re- 



