606 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



are arranged in 15 closely crowded columns on the centrodorsal; the arms are about 

 60 mm. long in the holotype; PI is about 7 mm. long, with about 24 segments; P 2 is 

 about 6 mm. long, with about 13 segments. 



i Description. The centrodorsal is conical, 2 mm. broad at the base and 2.5 mm. 

 from the apex to the midradial edge. The cirrus sockets are arranged in 15 closely 

 crowded columns, 3 in each radial area, each column having 4 or sometimes 5 sockets. 

 The tip of the centrodorsal beyond the functional cirrus sockets is finely spinulose. 

 The cirri are about LXV, 24-34 (the longer usually about 30), from 10 to 23 mm. 

 long, slender and slightly curved distally. The first segment is twice as broad as long, 

 the second is half again as broad as long, the third is about two and a half times as 

 long as its median width, and the fourth to sixth are nearly four times as long as the 

 median width. The segments following slowly decrease in length so that the outer- 

 most five or six are about as long as broad. The third and following segments increase 

 slowly in width distally, and the somewhat produced distal edge overlaps slightly the 

 base of the segments succeeding. The longer earlier segments have the proximal 

 end slightly enlarged. On the third and following segments the central dorsal portion 

 of the distal edge is produced outwardly and distally. Distally this production gradu- 

 ally narrows, at the same time involving more and more of the dorsal surface of the 

 segment. On the outermost segments of the longest cirri it becomes a high, more or 

 less narrow, subcarinate or even sometimes carinate elevation with a convex crest, 

 the dorsal end of which rises for some distance above and overlaps the base of the 

 segment succeeding. The opposing spine is long, conical, sharp, and glassy, about 

 as long as the distal end of the penultimate segment, from almost the entire dorsal 

 surface of which it arises. The terminal claw is longer than the penultimate segment, 

 rather slender and moderately curved. 



The radials are just visible beyond the rim of the centrodorsal in the midradial 

 line. Their distal border is very strongly concave, the lateral portions being extended 

 far upward separating the bases of the IBri. The IBri are very narrow and bandlike, 

 curved strongly upward laterally, five or sLx tunes as broad as the median length. 

 The distal border is produced and armed with rather long fine webbed spines. The 

 IBr 2 (axillaries) are rhombic, broader than long, with all the sides concave, especially 

 the two distal, the distal angle narrow and much produced, and the lateral angles 

 also narrow and produced, considerably overhanging the laterodistal angles of the 

 IBri. The distal borders are everted and armed with evenly spaced rather long broadly 

 webbed spines. 



The 10 arms are about 60 mm. long. The first brachials are between four and five 

 times as broad as the median width. The inner half tapers from the median line 

 almost to a point, and the proximal and distal edges of the outer half diverge so that 

 the outer side is about twice as long as the length in the median line. The proximal 

 border is slightly everted and smooth, and the distal border is strongly everted and 

 armed with a row of webbed spines. The second brachial is irregularly quadrate, 

 about half again as broad as long. The inner border curves inward over the inner 

 ends of the first brachial forming a conspicuous water pore. The distal border is 

 strongly everted and armed with webbed spines. The first syzygial pah- (composed of 

 brachials 3+4) is not quite twice as broad as long, and is half again as long interiorly 

 as exteriorly. The hypozygal is wedge-shaped, about three times as long interiorly 

 as exteriorly. The inner and outer sides of the epizygal are of about the same length, 



