104 AET. II. A. IZUKA : 



tlie length of its ceratophore equals, or even exceeds, that of the 

 style. Tentacular cirri slender, reacliing to tip of anterior 

 tentacles. 



The first 4 setigerons segments distinguished from the others 

 liy tlieir greater length, as well as by the longer and more 

 slender cirriform process of parapodia. The first segment is the 

 longest of all, and in its anterior parts the widest ; the succeeding 

 three segments become successively shorter, thus gradually ap- 

 proaching typical form, which is short, wide and depressed with 

 nearly flat dorsal and ventral surfaces. Anal segment somewhat 

 funnel-like, with a pair of crowded, long, slender caudal cirri. 



Branchia simple, appearing as a direct continuation of the base 

 common to it and dorsal cirrus. It is erect and just reaches tlie 

 middle hne of back when best developed. Eraiichiae appear on 

 5tli parapodium as a slender filament eiualling the cirrus in 

 length, l)ut posteriorly they quickly increase to a considerably 

 greater length, and then continue to exist without change except 

 undergoing a slic^ht decrease in size as far the 110th segment. 



Hooked bristles are confined to the first tln-ee pairs of para- 

 podia ; their end with 3 processes, of which the terminal one is tho 

 longest ; guard prolonged into an acute tip which reaches far be- 

 yond the body of the bristle (fig. 8). Slender setose bristles pre- 

 sent in all parapodia. Pectinate bristles with slender stems and 

 obliquely truncate, slightly curved terminal blades l^earing about Iß 

 delicate teetli. Posterior hooks, 2 in immber, with longitudinally 

 striated stem and bifid guarded tip (fig. 9). 



Tube delicate, mucoid, covered witli. fine mud. 



Habitat : — Yahagi line, about 290 fathoms, in Sagami Bay ; 

 " North of 8endai Bay," 02 fathoms (" Albatross ") ; Sagami Bay 

 175-191 fatlioms ("Albatross"). 



