52 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 25 



silt. Their greatest concentrations were noted in bottom samples at 

 VELERO IV Stations 5354 (112 specimens), 4837 (41), 4835 (37), 

 5538 (33), 4785 (27), 5741 (27), 5748 (26), and others. 



The body is depressed, linear and bluntly rounded at either end. Color 

 in life and preserved is ivory white or the dorsum is somewhat rust- 

 colored ; the small prostomial eyes are black. Length of larger specimens 

 is 10 to 15 mm and width to 2 mm. The body is completely covered 

 dorsally by the overlapping elytral pairs. Segments number about 38 and 

 elytra 26 to 28 pairs. 



The prostomium consists of a pair of triangular lobes separated by a 

 broad deep emargination (PI. 2, fig. 1). The 4 eyes are at the sides, 

 with those of a side nearly in contact. Prostomial peaks are weakly 

 developed. The median antenna is thick at the base and tapers distally; 

 it has a short, clavate style. A pair of equally long dorsal and ventral 

 processes is directed forward to the palpi, beyond the tips of the median 

 antenna. The paired palpi are thick, taper distally, and are directed 

 forward. The everted pharynx has 18 terminal papillae and 2 pairs of 

 dark amber jaws. 



The ventral side of the body is flat and smooth, with a few small 

 papillae along the lower lip in irregular arrangement. The first setigerous 

 segment has parapodia directed obliquely forward. Its setigerous fascicles 

 include a larger neuropodial, and a smaller notopodial bundle. Farther 

 back the parapodia are directed laterally. A median one has a dorsal 

 ramus with spreading fascicle of simple, distally tapering setae, and a 

 ventral longer branch with composite falcigerous setae (PI. 2, fig. 2). 

 Acicula occur singly and are deeply embedded, or they project slightly 

 from the distal end of the parapodial lobe. 



The first elytra are suboval and nearly smooth except for a double 

 row of small marginal and submarginal papillae along the outer side 

 (PI. 2, fig. 5). Farther back, elytra are subquadrate in shape (PI. 2, 

 fig. 6) and have papillae largely marginal at the outer and posterior 

 edges. In far posterior segments the elytral marginal papillae become 

 sparse and relatively larger in size. They are of several kinds ; some are 

 simple, slender, and terminate in a constricted tip (PI. 2, fig. 4) ; others 

 end distally in a petaloid process (PI. 2, fig. 3) ; all are penetrated by a 

 central canal, best seen in cleared mounted preparations. The anal end 

 terminates in a pair of long, cirriform processes, as long as the last 6 

 to 8 segments. 



Notopodial setae are of two kinds; the 4 to 6 supra-acicular ones are 

 sharply bent at a nearly right angle in the distal end and serrated along 

 the outer edge (PL 2, fig. 7). The subacicular fascicle has about 6 longer, 



