60 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



distal pinnules 6.5 mm. long with about 16 segments, very slender, the segments beyond 

 the two basal much elongated. 



Notes. The preceding description is based upon the larger specimen from Siboga 

 station 96. The type specimen, from Albatross station 5519, is smaller and less de- 

 veloped. It may be described as follows. 



The centrodorsal is small, low hemispherical or thin discoidal, the bare dorsal 

 pole about 1 mm. in diameter. The cirrus sockets are arranged in three closely crowded 

 alternating rows. 



The cirri are XXII, 11-12 (usually 11), 7 mm. long. The first segment is short, 

 the second is twice as broad as long, the third is from one third to one half again as 

 long as broad, the fourth is about twice as long as the median diameter, and the fifth 

 is not quite so long as the fourth. The following segments gradually decrease in length, 

 the antepenultimate being about one third again as long as broad and the penultimate 

 only slightly, if at all, longer than broad. The third and following segments are slightly 

 constricted centrally, with rather prominent ends, this feature gradually dying away 

 distally. The fourth and following segments have a slight serrate production of the 

 distal dorsal edge, which is not sufficient to appear in lateral view as a definite process. 

 The opposing spine is prominent, though small, terminal or subterminal, and the ter- 

 minal claw is slightly longer than the penultimate segment, rather slender, moderately 

 and evenly curved. 



The distal borders of the radials are even with the edge of the centrodorsal. The 

 IBr t are short, oblong, three times as broad as long, just in contact basally, the distal 

 border rather prominently everted, and with a prominent dorsoventrally elongated 

 tubercle occupying the outer half or two thirds of the median line. The IBr 2 (auxiliaries) 

 are almost triangular, about twice as broad as long, the lateral edges about one half 

 as long as those of the IBrj, the anterior borders, like those of the IBr!, strongly everted 

 and very finely serrate, and with a very prominent dorsoventrally elongate tubercle 

 in the proximal two thirds. 



The 10 slender arms are 80 mm. long. The first brachial is slightly wedge-shaped, 

 twice as broad as the median length, the two of each arm parr interiorly united for the 

 basal half, the inner sides thence diverging at a right angle; the distal edge is everted, 

 and there is a median tubercle in the distal half as on the IBr^ The second brachial 

 is of about the same size, but much more obliquely wedge-shaped; the distal edge is 

 strongly everted, and there is a median tubercle in the proximal half. The first syzygial 

 pab (composed of the third and fourth brachials) is slightly longer interiorly than ex- 

 teriorly, about as broad as the median length, with the distal edge very strongly everted 

 and the syzygial line raised into a sharp ridge. The following three brachials are 

 slightly wedge-shaped, twice as broad as the median length, with the distal edges very 

 strongly everted; those succeeding become very obliquely wedge-shaped, almost tri- 

 angular, about as long as broad, with the distal edges strongly produced and serrate, 

 and after the second syzygy longer than broad, and distally twice as long as broad. 

 The production of the distal edges of the brachials becomes rather less marked after 

 the proximal fourth of the arm, but persists to the tip. 



Syzygies occur between brachials 3+4, 9+10, 14+15, and distally at intervals of 3 

 muscular articulations. 



P! is 4.5 mm. long, slender, rather stiff, evenly tapering to a pointed tip, composed 

 of 12 segments, of which the first is about twice as broad as long, the second and third 



