568 PROCEEDINGS OF THE ACADEMY OF [J^ly, 



being but ^ as long as the first. The first abdominal torus is not more 

 than h as long as the last thoracic, and is on the level of the thoracic 

 setae tufts. The first thoracic torus bears 65 uncini and an equal num- 

 ber of pick-shaped setae, the fifth 43 and the last 33. Anterior abdomi- 

 nal tori have about 25 uncini and the setfe tufts about 15 setae, less dis- 

 tinctly in 2 rows than in other species. 



All of the collar setae and the dorsalmost setae of other thoracic fasci- 

 cles are of the usual slightly curved, acute, tapering form with short, 

 rather narrow, obliquel}^ striated wings which arise at an angle with 

 the stem. Not over about a dozen occur in each fascicle. Spatulate 

 setae (fig. 30) are much less numerous than in P. splendida, and arranged 

 in only 2 or 3 vertical rows. The wings are decidedly long, the entire 

 expanded region being 3 times as long as wide, with an apical arm 

 exceeding in length its greatest diameter. The striation of the blade 

 is unusually faint. Al^dominal setae (figs. 2S, 29) are few (about 15 

 in anterior tori) , not distinctly arranged in two rows, and the longer and 

 shorter ones not greatly different. The stem is constricted but not 

 sharply bent at the base of the blade. 



Avicular uncini (fig. 31) of similar form occur throughout the tho- 

 racic region. The base is only moderately elongated and slightly 

 curved, the breast rather prominent, the neck moderately long and 

 sloped forward, the crest well forward and forming a straight profile 

 with the slender acute beak. Abdominal uncini (fig. 32) are much 

 smaller, with very short bodies slightly curved downward posteriorly, 

 the breast deep and full, neck and crest similar to those of the thoracic 

 uncini, but the beak much shorter and smaller. The pick-shaped or 

 pennoned setae (fig. 33) have slightly curved stems, elongated flattened 

 heads, very difficult to see clearly, and high compressed hoods drawn 

 out at a wide angle with the stem into delicate pennants. 



No color remains except on the branchiae, the ventral ones of which 

 have 6 or 7 rich wine-color spots on the barbs and slightly on the stems. 

 On some of the dorsal branchiae these spots coalesce so that they are 

 chiefly colored, with a few irregular white spots at the base and a more 

 extensive white region toward the tip. 



The tube is dark colored, rough, brittle and covered with sand. 



This species is known from the type only, taken June 7, at station 

 4,230, in the vicinity of Naka Bay, Behm Canal, on a rocky bottom, 

 in lOS to 240 fathoms. 



