EKKAN'ilATE rOLYClIAETA OF JAPAN. 8o 



AViitral setae (fiij;. 10) brownish in colour ; the shaft slightly 

 <lilatcs ui)war(ls and towards tlio spur, whouco tlio thickness 

 diminishes to the tip. Pinnae of the terminal portion gradually 

 increase in length from tlie base to apex. 



The arrangement of cirri seems to be the same as i]i the 

 tyi)ic;d species. Nothing is of Tnore diagnostic value than the 

 condition of the ventral cirrus, whicli forms a very minute filiform 

 process about the middle of the greatly elongated parapodium. 



Anus situated on a prominent l>uttondike elevation in the 

 middle line at the posterior extremity. It is covered by the last 

 l)air of elytra. 



Habitat : — Numa, in Sagami Bay, about 258 fathoms ; Suruga 

 l-jay, 20 fathonis (" Albatross ") ; Totomi Sea, 34 fathoms (" Alba- 

 tross '") ; North Japan, 81 fathoms ("Albatross"). 



Family Sigalionidae. 



Body long and narrow; elytra and cirriform gills on alternate 

 segments in anterior parts down to the 26th segment ; more 

 posteriorly the gills coexist with elytra on every segment. 

 l'j"ostojnium rounded, often with a nuchal collar [)osteriorly. No 

 facial (uhercle. ^[ediaii tentacle, when present, generally long 

 an<l with ctenidia a( the sides of base. Lateral tentacles fused 

 ^vltll Ikisc of jeiifaciilar ciii'i. only (he lips emei'ging. Eyes four. 

 occasionally only (wo. or absent. Suhteiitacles long, attenuate 

 and siiionlli, will) luiccal clenidia al base. Dorsal l)ristles spinous 

 and tajH'riiig. N'entrai brist les coniponnd. 



Key to the genera. 



(I. ;\l.'ili;iii Iciil.uli' ;il)S(Mil Sitjalion. 



a". Mftli.iii (( iitiult'. .slioil, \villum( cei.itophore. 



