1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 431 



cirrus is somewhat longer aud rises nearer tlie base ; the ventral cirrus 

 is nearly as large, but not quite so long as the dorsal, and the setigerous 

 lobe is bilabiate, with the two lips less unequal in size 5 the posterior one 

 is flattened aud a little longer and narrower than the anterior, which is 

 obtusely rounded at the tip. The setae are more'slender, more numer- 

 ous, less spine-like than in the preceding segments. The parapodia of 

 the third segment are a little smaller than the second, with the dorsal 

 aud ventral cirri nearly the same, but the posterior lip of the setigerous 

 lobe becomes decidedly longer, narrower aud more tapered, consid- 

 erably longer than the anterior lip, which is short, flat, and obtusely 

 rounded at the end ; the setae form a fascicle of four or Ave, and are 

 more slender and acute. The parapodia of the fourth segment difler 

 from those of the third in having the ventral cirrus much reduced in 

 length in the form of a short, somewhat compressed, obtuse ijapilla 

 slightly separated from the base of the setigerous lobe ; the length of 

 the posterior lip of the setigerous lobe is also increased, while the ante- 

 rior one is more reduced. 



On the fifth segment the ventral cirrus becomes still shorter, broader, 

 and more verruciform, while the posterior lip of the setigerous lobe 

 becomes slender, tapering, and cirriform, but the anterior lip becomes 

 more rudimentary. On the succeeding segments the vertral cirrus be- 

 comes more and more reduced in length and increased in transverse 

 breadth, in the form of a broad, low wart or cushion, below the bases 

 of the parapodia, which beyond about the twenty-fifth is decidedly 

 broadest in a transverse direction. The branchiae commence at about 

 the twenty-eighth segment in the form of a long, slender, tapering cir- 

 rus arising from the base of the dorsal cirrus, which it at first equals 

 or somewhat exceeds in size and length. Farther back the branchiae 

 increase in size and length, while the dorsal cini gradually decrease, 

 so that along the middle region of the body the branchia is long 

 and slender, equal in length to about one-half the breadth of the body, 

 while the dorsal cirrus is a small, slender, tapered papilla, not more 

 than one- eighth as long. The caudal segment is small, narrow, rounded 

 or truncate at the end, and bears two long, slender caudal cirri, nearly 

 as long as the longest antennae but much more slender. 



The color of preserved specimens is light yellow, usually with a brill- 

 iant iridescence anteriorly, and usually with a dark brown median dor- 

 sal stripe consisting of two rows of spots, a pair to each segment, but 

 the median stripe is not unfrequently absent, especially on the anterior 

 segments. 



Stations 869, 879, 880, 881, 894 in 192 to 365 fathoms, 1880. Also taken 

 in great abundance at many stations in subsequent seasons by the Fish 

 Hawk and Albatross, in 110 to 500 fathoms. Among others at stations 

 2170, 2175, 2178, 2200, in 148 to 452 fathoms, 1884, at all of which it was 

 abundant. 



