470 PROCEEDINGS OF THE ACADEMY OF [Jline, 



The notopodial group is the larger, and both consist of a fan-shaped 

 groups of two kinds of setae intermixed, except in the last 20 or so 

 somites where only one kind occurs. There are coarse, stiff bristles 

 arranged at regular intervals, 8-10 in the dorsal, 6-8 in the ventral bun- 

 dles, olive-green, densely striated and granulated internally, except 

 toward the tip, curved, tapering rapidly to the attenuated outer }, 

 which is colorless and fringed along one margin with overlapping hairs 

 or plates, ^>r^^ slender hair-hke setae are scattered among the coarse 

 ones, and are 2 or 3 times as long as they, nearly colorless, with internal 

 striae having a slight spiral turn, continuously tapering, slightly en- 

 larged at base of exposed portion, and provided, except near the base, 

 with very delicate half-round scales which are rather distant, usually 

 alternate on the two sides and toward the tip become reduced to 

 minute cilia-like processes. Posteriorly the coarse setie become much 

 stouter, lose their delicate tips and form very prominent, slightly 

 curved, blunt-pointed spines, while the capillary ones become smaller, 

 and eventually disappear. 



Sagami Bay, 3,698, 153 fms. Type only. 

 Chsetozone (?) abranchiata (Hansen). 



Under the name of Cirratulus abranchiatus Hansen described this 

 species firom much smaller specimens in which he found no trace of 

 branchiae. Otherwise his specimens closely resemble those collected 

 by the "Albatross," which are referred to Hansen's species on the 

 supposition that the types were imperfect. As this opinion may be 

 erroneous a description is added. 



Form short and very stout and thick in the contracted specimens, 

 tapering about equally to the two ends which are similarly bluntly 

 pointed ; somewhat depressed with dorsal and ventral surfaces about 

 equally convex and the parapodia forming a somewhat thickened 

 marginal ridge. The type has 127 somites and is 38 mm. long by 8 

 mm. wide. The other specimen is larger. 



Prostomium obtusely rounded, somewhat upturned, less than twice 

 as broad as long ; no eyes ; mouth rather slit-like with lateral lips. Per- 

 istomium a simple ring not especially enlarged, resembling the next 

 2 somites which are much shorter than the prostomium but more than 

 twice the length of the succeeding somites. First 3 somites achaetous 

 but not especially marked off from the succeeding ones, the increase 

 in width being regular, though rapid; remaining somites short and uni- 

 annulate, the last few indistinct. Anus minute, dorsal, above a small 

 tubercle-like pygidium. 



