152 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



to 9 mm. long. The 13 arms are 30 mm. long. In arms arising from a IIBr axillary 

 the syzygies are between brachials 3+4, 13 + 14, 18+19, etc., with an interval of only 

 2 muscular articulations. P! is 3.3 mm. long with 12 segments. P 2 is 6 mm. long 

 with 15 segments. P b is 5 mm. long with 12 segments. P 3 is 3 mm. long with 11 

 segments. P 4 is 2.5 mm. long with 12 segments. The proximal pinnules are slightly 

 carmate on the distal side. The distal pinnules are 5 mm. long with about 18 seg- 

 ments. The disk has been lost. The color is more uniformly yellow than in most 

 of the specimens. 



In another specimen from Bock's station 6 the cirri are XXIV, 18-22, from 7 to 



9 mm. long. The 10 arms are 40 mm. long. The distal intersyzygial interval is 3 or 4 

 muscular articulations. P! is 3 mm. long with 10 segments. P 2 is 5.5 mm. long 

 with 15 segments. P b is 3.7 mm. long with 10 segments. P 3 is 2.5 mm. long with 



10 segments. P 4 is 2.2 mm. long with 10 segments. The distal pinnules are 5 mm. 

 long with 21 segments. 



In another specimen from Bock's station 6 the cirri are XXI, 16-19, from 5 to 7 

 mm. long. The 15 arms are 25 mm. long. The distal intersyzygial interval is 2-3 

 muscular articulations. The brachials are rather long and juvenile. P! is 3 mm. 

 long with 10 segments. P 2 is relatively small, 4 mm. long with 11 segments. P b 

 is 2.2 mm. long with about 9 segments. P 3 is 2 mm. long with 9 segments. The distal 

 pinnules are 3.5 mm. long with about 15 segments. 



According to Gislen the specimen from Bock's station 19 has the centrodorsal 

 large and discoidal, with the bare dorsal pole 2.8 mm. in diameter. The cirri are 

 XXIII, 23-25, from 10 to 11 mm. long, and are arranged in two rows on the centro- 

 dorsal. All of the cirrus segments are broader than long; the proximal ones are the 

 longest, one-third again as broad as long. From the sixth segment onward a double 

 dorsal spine is developed which on the fifteenth (to seventeenth) becomes a single 

 spine which in height is equal to one-fourth the width of the segment. The paired 

 prominences are distinct, though close together, being indistinct only on the sixth- 

 ninth segments on which they almost form a transverse ridge. The antepenultimate 

 and the segments immediately preceding have smaller spines. The height of the 

 opposing spine is half the width of the penultimate segment. The terminal claw is 

 about as long as the penultimate segment, and is stout and somewhat curved. The 

 radials are visible as narrow bands beyond the rim of the centrodorsal. The IBr, 

 are four times as broad as long (0.8 mm. in width) and are free laterally. The IBr 2 

 (axillaries) are half again as broad as long. The IIBr series are 2. The IIBr! is from 

 half again to twice as broad as long, and is shorter on the inner than on the outer side. 

 The ossicles immediately following the axillaries are united ulteriorly. Slight synar- 

 thrial tubercles are developed. The 19 smooth arms are 50 mm. long. After the 

 seventh the brachials become wedge-shaped and distally triangular with swollen 

 articulations. There are 18 brachials for each 10 mm., or 16 if the syzygial pairs are 

 counted as units. Syzygies occur between brachials 3+4, 15 + 16 (or 18 + 19), and 

 distally at intervals of from 7 to 10 (usually 9 or 10) muscular articulations. P t is 

 4 mm. long with 12 segments; it is occasionally absent on the inner arm from a IIBr 

 axillary. P 2 is 7 mm. long with 14 segments of which the distal have spiny collars. 

 P a is most often absent. P b is 5.5 mm. long with 12 segments. P is shorter than 

 P b . P 2 and P b are very much stouter than the other pinnules; their longest segments 



