EKKANTIATE POLYCHAETA OF JAPAN. 175 



as the base of parapodia arc of an almost pale flesh colour. 



Prostomium somewhat triangular, with the angular points 

 slightly truncate (PI. XIX, fig. 1). One of tliese is directed an- 

 teriorly, and bears a pair of small tentacles, which are about 4 

 the length of prostomium. Palpi large and conical, arising from 

 the two antero -lateral sides of prostomium, extending far beyond 

 tip of tentacles ; terminal boss small. 



The two pairs of eyes very small and black ; the posterior 

 l)air situated very close to the posterior Ijorder of prostomium, 

 and tlio anterior pair placed a short distance in front of the pos- 

 terior, Eyes moi'o widely separated in the f<3rmer than in the 

 latter. 



I.ongest tentacular cirrus (7 mm. in length) reaches to 

 middle of 6th segment, wlion stretched posteriorly along the 

 body ; shortest pair about -J- the length of the longest. 

 Peristomium slightly longer than tlie next succeeding seg- 

 ment. 



Anteriormost pair of parapodia small ; thus, in tlie 5th 

 parapodium t]io d(3rsal ramus is slightly <leeper tlian the vent- 

 ral ; the Superior and middle ligulae and the pre-setal lobe of 

 dorsal ramus are all nearly similarly sliaped, being elongate 

 conical ; the two setal lobes of ventral ramus are nearly equal in 

 length to the middle ligula ; and the inferior ligula is much sliorter 

 vthan tlu! middle, tliougli of about the same shape. The dorsal 

 cirivus, ••'•ising fi-om the middle of the dorsal border of parapodium, 

 ta\icrs distcilly, iiiid ils tip does not reacli to tliat of the superior 

 ligula ; (lie venti'al ciiriis, aiising from the l)ase of parapodium, 

 is almost eijual in length to the dorsal cirrus. 



Parapodia, especially tlie dorsal rami, gradually enlarge pos- 

 teriorly. Ill ildth parapodium (fig. 5), tlie superior ligula is 



