294 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 15 



uncini and the presence of slenderer, longer parapodia in the abdomen. 

 The prostomium is acutely pointed in front and has no visible eyes. 

 Branchiae are first present from the seventh setigerous segment and 

 increase in size, so that within two segments they are lanceolate or 

 laterally compressed, and terminate in a slender filamentous tip (fig. 2). 

 Branchiae are continued on all segments and are visibly fimbriated along 

 their lateral margins. They are simple, Ungulate at maximum develop- 

 ment, and directed dorsally. 



Thoracic neuropodia have conspicuous transverse, palisaded rows of 

 curved uncini, without pointed setae. At maximum development in the 

 middle thorax, there are about four vertical rows of uncini. The anter- 

 iormost row is longest and has the thickest, largest and most sharply 

 curved uncini (fig. 3) ; those in more posterior rows are gradually 

 slenderer and shorter and less sharply bent near the tip (fig. 4). All are 

 smooth along the shaft and without terminal hood. 



Abdominal notopodia have a long, slender postsetal lobe (fig. 2), a 

 fascicle of long pointed setae, and two or three furcate setae ; the fascicle 

 is accompanied by a single aciculum which projects slightly from the 

 parapodium. Abdominal neuropodia have a thick acicular lobe and a 

 much shorter subacicular lobe (fig. 2) ; all setae are pointed and the 

 single aciculum projects from the distal end of the parapodium. Seen in 

 lateral view (fig. 5) the aciculum is slightly curved at its distal end and 

 tapers to a blunt tip. 



Posterior thoracic and anterior abdominal (fig. 2) segments are 

 characterized by the presence of subpodial lobes in vertical series. They 

 are first present on about the fifth last thoracic segment, where the 

 neuropodial ridge has a short lobe at its midlength. A longer lobe is 

 located at the ventral edge of the ridge; this resembles a ventral cirrus. 

 In the following segment the neuropodial lobe is longer and there are 

 two equally long slender subpodial lobes. On the last three thoracic 

 segments there are three or four long, slender subpodial lobes. This 

 pattern is continued through about fifteen abdominal segments, but 

 diminishing so that the first three have three slender lobes in a row, the 

 next five or six segments may have only two lobes, and the next six seg- 

 ments have single lobes resembling ventral cirri. Thereafter the lobes 

 are absent. 



One specimen has a posterior end with a pygidium ; the body narrows 

 posteriorly and terminates in a thickened rim with middorsal incision; 

 a pair of long slender filaments is inserted at the dorsolateral edge. 

 Such a fragment has branchiae present on the last body segment as a 

 pair of small, slender filaments. 



