442 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Syzygies occur between brachials 3+4, again between brachials 10 + 11 or 

 12 + 13, and distally at intervals of 5 or 6 muscular articulations. 



P! has 13 segments, and is only slightly shorter than P 2 , which has 10 segments. 

 The distal pinnules have about 15 segments. The terminal pinnules extend for 3 

 mm. or 4 mm. beyond the tips of the arms. 



Notes. In the specimen collected by Capt. H. Christiansen south of the Goto 

 Islands the arms are 95 mm. long and the cirri are X, 82-89, 70-80 mm. long. The 

 elements of the division series and first two brachials are narrowly subcarinate, with a 

 median slightly raised line. 



In one of the two specimens from Dr. Sixten Bock's station 12, according to 

 Gislen, the centrodorsal is 3 mm. broad at the base with a visible height of 2 mm. ; 

 the dorsal pole bears 5 radial tubercles close together arranged around a small central 

 cavity. The cirri are XVI, 55-75, 45-55 mm. long, in five groups separated by 

 inconspicuous radial interspaces. The segments from the tenth to the twenty-fifth 

 are from one-third to half again as long as broad. From about the thirtieth segment 

 the length equals the width, from the fortieth the segments are half, again as broad 

 as long, and the distal are twice as broad as long. At about the twenty-fifth segment 

 the cirrus becomes serrate on the dorsal side in lateral profile, the height of the dorsal 

 spines being one-quarter the width of the segments, on the distal segments less. The 

 opposing spine is one-third the width of the penultimate segment. The terminal 

 claw is a little shorter than the penultimate segment. The cirri are laterally com- 

 pressed. 



The radials are three times as broad as long with a small well circumscribed 

 median tubercle. The IBr t are somewhat broader than the radials, in close contact 

 laterally and joined to the IBr 2 by a close synarthry. The IBr 2 (axillaries) are twice 

 as broad as long. There is no synarthrial tubercle on the IBr series. The ossicles 

 are laterally flattened as far as the fourth brachial. 



The 10 arms are 65 mm. long. The first brachials are interiorly united for about 

 one-third of their length; like the second brachials, they are longer exteriorly than 

 interiorly. After the tenth the brachials become oblique. After the fiftieth (to 

 sixtieth) brachial there is a prominent median distally directed dorsal crest which on 

 the outermost brachials becomes a strong spine rising to a height of from one-third 

 to one-half the width of the brachial when viewed laterally. Seven or eight of the 

 terminal brachials have only rudimentary pinnules. 



Syzygies usually occur between brachials 3 + 4, 21+22, 32+33, 42+43, etc., with 

 an interval of 8-10 muscular articulations. On one postradial series one of the arms 

 has syzygies between brachials 3+4, 5 + 6, 22 + 23, and 38+39, while the other arm 

 has the first syzygy between brachials 27 + 28. 



PI is about 5 mm. long with 9 or 10 segments, stout and thick, with prismatic 

 segments of which the first two are short and those following are somewhat longer 

 than broad. P B is 5 mm. long with 10 segments and is a little more slender. P 2 is 

 5 mm. long with 8-10 segments. P 3 is similar. The distal pinnules are 6.5 mm. long 

 with 16 segments. The disk has been thrown off. The color in alcohol is white. 



In the other specimen from Dr. Sixten Bock's station 12 the cirri are XV, 85-90, 

 75-80 mm. long; a dorsal spine is developed from the fortieth segment onward. 

 There is a slight synarthrial prominence on the IBr series; each of the ossicles of the 



