522 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



penultimate segment, moderately stout, evenly tapering, and moderately and evenly 

 curved. 



The ends of the basal rays are visible as small tubercles in the interradial angles 

 of the calyx bridging over the narrow clefts between the centrodorsal and the radials. 



The radials are only very slightly visible in the interradial angles over the ends 

 of the basal rays. The IBri are almost entirely, or quite, concealed, very short, 

 and almost entirely united laterally. The IBr2 (a.xillaries) are broadly pentagonal, 

 t^vice as broad as long, with the anterior angle rather produced and the lateral edges 

 free. The IIBr series are 4 (3+4), well separated laterally; the IIBri are united 

 in their pro.ximal two-thirds, but separated by a broad U-shaped gap distally. The 

 IIBr series are 2, very rarely 4 (3 + 4). 



Arms 30-31, slender, from 70 to 80 mm. long. The first 2 bracliials are approxi- 

 mately equal, slightly wedge-shaped, about twice as broad as the median length; 

 the first are almost entirely united interiorly. The first syzygial pair (composed of 

 brachials 3 + 4) is from half again to twice as broad as long, oblong in shape. The 

 next 3 brachials are oblong, about twice as broad as long, and those following become 

 wedge-shaped, almost triangular, half again as broad as long, after the proximal 

 third of the arm becoming gradually less obliquely wedge-shaped, though remaining 

 of about the same relative length, and in the terminal portion of the arm becoming 

 wedge-shaped and as long as or longer than broad. The elements of the division 

 series have everted and prominent finely spinous distal ends, and the brachials have 

 strongly produced and overlapping finely spinous distal ends. 



Syzygies occur between brachials 3 + 4, 11 + 12, or 12 + 13, and distally at intervals 

 of 4 musciilar articulations. 



The disk is 13 mm. in diameter. The mouth is marginal and radial. There are 

 a few scattered calcareous granules about the central anal tube. 



Pd is 15 mm. long, slender, and composed of 40 segments, all of which are approxi- 

 mately as long as broad. The terminal comb arises suddenly and is made up of 7 

 teeth which are triangular, longer than broad, rather longer than the width of the 

 segments which bear them, rather strongly incurved, and basally in apposition. 

 Pi is similar, slightly less stout basally, equal in length or slightly longer. P2 is small 

 and weak, 6 mm. long. P3 is similar, composed of 20 segments and 5 mm. long. 

 P4 is 6 or 7 mm. long, considerably stouter than the 2 preceding pinnules, with the 

 distal ends of the segments strongly produced and bearing a gonad. The following 

 pinnules are slightly stouter, with larger gonads, and slowly increase in length. The 

 distal pinnules are very slender, about 9 mm. long, and are composed of about 20 

 segments, of which the first 2 are short and the following increase in length to about 

 twice as long as broad, then decrease again in the terminal portion. 



The color in alcohol is white, the arms bej'^ond the basal portion with broad 

 broken lateral lines and dorsal bands of violet; the cirri are white with occasional 

 bands of light violet. 



Notes. — The specimen from Siboga station 282 has 20 arms 65 mm. long, and 

 the cirri XIII, 14, 8 mm. long. In the cirri the fifth or sixth, usually the former, is a 

 transition segment. 



