EKEANÏIATE POLYCPIAETA OF JAPAN. 115 



of l)o(l\' not far boliiiul head, near the begmniiig of the branchi- 

 foi'ous region, i.e., at about the lOth segment. 



The general, colour is a h'ght brown ; somewhat darker in 

 intersegmental grooves. 



l^rostomium somewhat conical in shape, with a very small 

 note]), in its anterior border, deeply grooved below. Tentacles 5, 

 all smooth ; the median longest, equalling the anteriormost 6 seg- 

 ments in length : the inner laterals a little shorter ; the outer 

 laterals still shorter, equal to half the length of the median. 

 Eyes 2, large, and of the form of a rounded triangle. Tentacular 

 cirri remarkably long, extending beyond anterior border of the 

 buccal segment, in some cases even beyond the front of prostomium. 



Parapodia comparatively long and slender, with long bristles ; 

 dorsal and ventral cirri well developed (fig. 7), but not annulated. 



Bristles are of 4 kinds ; the long setose, and the pectinate 

 bristles in the dorsal bundle ; the compound bristles (fig. 8) with 

 short, 2-toothed and guarded end-piece ; the posterior hook (fig. 

 !J) with a, large subterminal tooth. 



Large branchiae cover tlie anterior one-third of the body, 

 commencing usually on 7th — 10th segment, but very rarely on 

 the Ifh, and disappearing on 40th-.jUth segment. Maximum num- 

 Ihm' of lihiments 20. 



The dciiiai ;i |t|>;ira(us yellow ill colour, characterized by the 

 small size, delicacy and calcareous composition of its plates 

 and by the asyiiiiiietry of the great dentals. The great dental 

 |'l;ib's wilh (ccdi 1)11 (he right, and (> on. the left ; the unpaired 

 lel'l pliiic witli '> (ccth: (he pjiii'ed hdeivd plates with 7 teeth on 

 Mie i'igl)(, îind li en (he ler( ; (wo inKMjnal accessory pieces on 

 e;ieli side. Tlie cii((iiig e(|g(' of inaudibles with o teeth on the 



l.-fl, JMhl -J Mil (lie ri-||(. 



