726 BULLETIN S2, UNITED STATES NATIONAL MUSEUM VOLUME 1 



in the larger specimens. The dorsal pole is large and very rough, being thickly covered 

 \vith tuftlike protuberances. The cirrus sockets are closely set, arranged in slightly 

 irregular columns of from tliree to five, usually four, sockets. There are three columns 

 to each radial area so that the number of sockets is about sLxty. 



Cirri about LX, 21-36, up to 20 mm. in length, long and slender. The first seg- 

 ment is short, the second is about as long as broad, and the third is about twice as long 

 as broad and slightly constricted centrally. The fourth to the tenth or so are consider- 

 ably longer than broad — the earlier may be four tunes as long as the least width. Tliey 

 are slightly constricted centrally and the distal end of each is expanded so as to form a 

 flare around the base of tlie next. The outer segments are shorter, but even the most 

 distal are slightly longer than broad. Each is broader distally than proximally, the 

 greater widtli being on the dorsal side so that the side of the end of the cirrus has a 

 serrated appearance. The shorter distal segments are slightly broader than the elon- 

 gated pro.ximal segments, so that the end of the cirrus is a little heavier in appearance 

 than the rest. The opposing spine may be weak or moderately strong and may be 

 directed obliquely forward or stand out at right angles to the penultimate segment. 

 The terminal claw is strong. 



The radials are visible in the midradial line, though very short. They are produced 

 into high angles, and more clearly seen, laterally. The distal edge is strongly concave. 

 The IBri are from four to six times as broad as long, only slightly incised by the axilla- 

 ries, and not in contact laterally although their sides are straight or even sHghtly 

 divergent. The IBr2 (axillaries) are about as broad as long with the distal edges 

 strongly concave, the pro.ximal only slightly so. The distal edges of the elements of 

 the IBr series may be raised into slight finely thorny ridges. 



The arms are broken in all the specimens. The longest remaining, in two of the 

 larger specimens, measiu-e 15 to 17 mm. from the axillaries and consist of 20 brachials. 

 The first brachials are short and somewhat wedge-shaped, much shorter interiorly 

 than exteriorly. They are incised, though not deeply, by the second brachials. The 

 proximal margin of the second brachial is a broadly rounded triangle. The interior 

 edge is very short and the exterior about tliree times as long, so that the distal edge, 

 which is concave, runs back obUquely. The first syzygial pair (composed of brachials 

 3-1-4) is longer interiorly than exteriorly. The four brachials (the fifth to the eighth) 

 between the first and second syzygial pairs alternate in that the interior edge of one and 

 the exterior of the next is the longer. The difference between the interior and exterior 

 lengths is greater in the fifth to seventh than in the eighth brachials. Each is about as 

 broad as its greatest length. In the fifth brachial tJie proximal interior corner is pro- 

 duced backwards and the distal interior corner strongly produced forward so that the 

 interior edge is much longer than the exterior and the proximal and distal edges are 

 obUque; the latter is sHghtly concave. On the sLxth brachial the pro.ximal exterior 

 corner is stronglj' produced backwards, the distal exterior corner produced forwards. 

 The proximal interior corner of the seventh brachial is strongly produced backwards. 

 The distal interior corner maj^ be sHghtly produced forwards. The eighth brachial is 

 less iiTegular ; the pro.xhnal exterior corner is slightly produced backwards; the brachial 

 reaches slightly farther forward on the interior than on the exterior side, but the corner is 

 not produced. The edges of these brachials may be slightly raised and produced into fine 

 inconspicuous spines. The brachials beyond the second syzygial pair are of a different 

 shape from the lower. One lateral edge, alternately the interior and the exterior on 



