36 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



PI and tapering slowly and evenly to the tip. It is composed of 20 segments of which 

 the first is twice as broad as long, the fourth is as long as broad, and the last four or 

 five are about half again as long as broad. On the fifth a small portion of the distal edge 

 on the outer side is somewhat produced and serrate, with a prominent ridge running 

 downward from each tooth. This serrate portion of the distal edge rapidly increases in 

 extent on succeeding segments so that on the seventh or eighth and following the 

 whole outer half of the distal edge is moderately produced and everted, with con- 

 spicuous fine ridges running inward for a short distance from the teeth. 



P 3 is 7.5 mm. long with 15 segments. It is not so broad basally as P 1( and tapers 

 rather more rapidly in the first four segments. The first segment is about twice as 

 broad as long, and the fifth and following are about twice as long as broad. The 

 second, third, and fourth are rather strongly carinate, the carination being most 

 prominent on the third because of the shortness of the outer border of that segment. 



P 4 is 7 mm. long with 15 segments. It is not quite so broad basally as P 3 but 

 tapers more evenly. The carination of the earlier segments is scarcely perceptible. 



In the specimen from off Neira, Banda, the centrodorsal is discoidal, rather thin, 

 with inwardly sloping sides and a small concave dorsal pole. The cirrus sockets are 

 arranged in two closely crowded alternating rows. 



The cirri are XXVI, 35-37, 30 mm. long, with the outer third, as preserved, 

 strongly incurved. The cirri as a whole are rather slender. The first segment is 

 about three tunes as broad as long, and the second and following are nearly or quite 

 twice as broad as long, becoming half again as broad as long distally. The cirri taper 

 very slightly in the distal third or fourth. The distal dorsal edge of the second and 

 following segments projects slightly beyond the base of the segment succeeding. This 

 projection very slowly increases, the produced edge becoming very finely serrate. 

 On about the eighth to eleventh segment a depression appears in the midradial line, 

 in end view forming a rounded notch in the projection, and after two or three segments 

 the dorsal surface of the segments is seen to bear two prominent parallel longitudinal 

 ridges that extend from the distal to the proximal border, each of which is situated 

 midway between the middorsal line and the lateral border. One or two segments 

 farther on the distal end of the ridges broadens so that they develop a T-shaped form, 

 the cross bar of the T running slightly diagonally inward, and the inner end of the cross 

 bars of adjacent T's almost meeting. On the succeeding segments the stem of the T 

 becomes progressively shorter until the T is reduced to a caretlike angle with the 

 apex inward, and on the seventh or eighth segment before the penultimate is reduced 

 to a simple high and conspicuous, though blunt, tubercle. The two tubercles on the 

 dorsal surface of each segment are quite separate from each other; their apices mark 

 approximately the two ends of the middle third of the transverse width. On the 

 antepenultimate segment the tubercles are fused basally. The opposing spine is 

 much larger than the tubercles on the preceding segment, in lateral view broadly 

 triangular and arising from the entire dorsal surface of the segment, in end view 

 broadly triangular and arising from the entire width of the segment, and with the 

 apex broadly rounded or truncated. The terminal claw is small, scarcely longer than 

 the penultimate segment, stout basally but slender at the tip, rather abruptly curved 

 in the proximal third. 



