198 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 19 



with inconspicuous biramous parapodia (Fig. 1) from which the setae 

 project in sparse fascicles; the last 9 to 15 segments have long, dorsally 

 inserted branchiae. The posterior anal pore is surrounded by a pair of 

 dorsolaterally and similar, slightly longer ventrolaterally inserted cirri- 

 form processes (Fig. 2). The prostomium (Fig. 3) is a simple, depressed, 

 bluntly triangular lobe without eyes. The first ring is smooth, or some- 

 what biannulate ; all other segments are simple, uniannulate, with bira- 

 mous parapodia. The first three segments have only slender, distally 

 pointed setae in notopodia and neuropodia. The fourth segment has simi- 

 lar setae accompanied by thicker, distally falcate hooks with bifid tip ; 

 these hooks usually number one in a fascicle (Fig. 4), but an occasional 

 one has two or three hooks, all of one kind. Numbers of setae and hooks 

 in fascicles remain about the same except in posteriormost, branchial seg- 

 ments where setae are less conspicuous. 



Each long seta (Fig. 5) is serrated along the cutting edge and its tip 

 is pointed. The hook consists of a straight, embedded shaft, a slightly 

 curved free region, and a broader, laterally directed fang, nearly at right 

 angles to the shaft (Fig. 6) ; the accessory tooth is small and distal. The 

 alimentary tract of some specimens contains white calcareous ooze, such 

 as the sediments in the sample from which they were removed. 



These small, linear worms may be allied to the PARAONIDAE, 

 with which they agree in their small size, the presence of two kinds of 

 setae, and the presence of a well developed, simple prostomium. They 

 were at first thought to have affinities with oligochaetes, but this appears 

 unlikely in view of the characteristics named. 



Questa caudicirra was taken only on Farnsworth bank, Santa Cata- 

 lina Island in 16 fms, and on Lasuen sea mount, in 68 fms. 



Family CIRRATULIDAE 



Genus Cirratulus Lamarck, 1801 



Cirratulus, unknown species 



Collection: ?>t^. 21 31 (2). 



These individuals differ from known species of the genus, and may 

 represent an undescribed species. Length of the body is more than 30 mm, 

 width 3 to 4.5 mm, and segments number more than 67 (the tail is 

 lacking). The body is inflated through setigers 10 to 25, then depressed 

 cylindrical. Segments are uniannulate, wider than long, smooth, their 

 width up to 25 times that of their length in front, but only 1.5 times as 

 wide as long in middle and posterior segments. Setae are long, silky. 



