140 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



away distally. The opposing spine is represented by a minute tubercle, which may 

 be obsolete. The terminal claw is as long as the penultimate segment, or rather less, 

 and is moderately stout and moderately curved; it is semitransparent and glassy, in 

 contrast to the cirrus segments which are dull and opaque. 



The disk is lacking. The sacculi on the pinnules are small but numerous. 



The radials are concealed by the centrodorsal. The IBr] are also concealed by 

 the centrodorsal. The IBr 2 (axillaries) are very broadly triangular. The IIBr series 

 are 4 (3+4), with the distal ends of the component segments everted and finely 

 serrate. 



The 20 arms are 120 mm. in length. The first 9 or 10 brachials are oblong or 

 slightly wedge-shaped, rather more than twice as broad as long, those following be- 

 coming triangular, nearly as long as broad, in the distal portion of the arm wedge- 

 shaped again, and in the terminal portion elongate. All the brachials have slightly 

 overlapping and finely spinous distal ends. 



Syzygies occur between brachials 3+4, again about brachials 16+17, and distally 

 at intervals of five to eight muscular articulations. 



P D is 4 mm. long, small, weak, and slender, becoming very slender and flagellate 

 in the distal half. It is composed of about 20 segments of which the first four or five 

 are broader than long and the remainder are about as long as broad; the second-fourth 

 or -fifth have rounded triangular dorsal keels, which hi shape almost suggest over- 

 lapping spines. The basal segments have prominent and finely spinous distal ends, 

 and the dorsal carinate processes are covered with fine spines. P t is longer and stouter 

 than P D) though not quite so long as P 2 . P 3 is the longest pinnule, exactly like P] 

 and P 2 but slightly stouter basally, 12 mm. long, with about 40 segments, of which the 

 basal five or six are short and the remainder are about twice as long as broad. The 

 second and third segments in Pj, P 2 , and P 3 have an indicated dorsal process similar 

 to that on the basal segments of PI. The following pinnules gradually decrease in 

 length to about 7 mm. though remaining similar to the lower pinnules except that the 

 tip is not so slender, then gradually increase in length distally. The distal pinnules 

 are 11 mm. long with the first segment short and approximately oblong, about twice 

 as broad as long, the second about as long as broad, and those following becoming 

 very rapidly elongated and very long and exceedingly slender distally. The elongated 

 segments have somewhat abruptly expanded articulations, and all the segments, 

 especially the lower, have the ends more or less spinous and often scattered spines 

 on the dorsal surface. 



Notes. The eight specimens from off the Goto Islands are all much broken. The 

 centrodorsal is discoidal, moderately thick, that of the largest being 6.2 mm. in basal 

 diameter. The dorsal pole is flat or very slightly concave, in the largest being 4 mm. 

 in diameter. The cirrus sockets are arranged in one and a more or less complete sec- 

 ond irregular closely crowded marginal rows. Interradially the centrodorsals are 

 1.5-2 mm. high. The lateral borders slope inward only very slightly. The longest 

 cirri are 19 mm. long with 16 segments, which are subequal, one-third again to twice 

 as long as broad. All the specimens appear to have had 20, or about 20, arms. Those 

 of the largest are about 140 mm. long. As hi the type specimen, the distal edges of the 

 ossicles of the division series are everted and spinous. A small specimen has 10 arms 

 between 55 and 60 mm. long and the cirri 8 mm. long with 10-12 segments. 



