260 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Description. The centrodorsal is large, thin discoidal, with the dorsal pole flat, 

 regularly pentagonal, 2 mm. in diameter. 



The cirri are XXX, 10-11, 8 mm. long, small and slender, with the distal edges 

 of the short distal segments rather strongly produced. The first segment is very 

 short, the second is twice as long as the expanded ends, and the third is the longest, 

 about four times as long as the median diameter. The fourth is nearly as long as the 

 third, but has the distal end more expanded. The fifth is twice as long as its expanded 

 distal end. The following segments gradually decrease in length so that the ante- 

 penultimate is about as long as broad. The second and third segments have both 

 the proximal and distal ends considerably enlarged, slender, and broadly oval in cross 

 section. The fourth has the proximal end only very slightly enlarged, but gradually 

 expanding from the middle to the distal edge, which is produced and overlaps the 

 base of the succeeding segment. The following segments gradually increase in lateral 

 diameter, the enlargement of the distal ends gradually decreasing in extent. The 

 fifth and following segments have slight subterminal tubercles. The opposing spine 

 is terminal, minute, but larger than the tubercle on the preceding segment. The 

 terminal claw is nearly twice as long as the penultimate segment and is strongly 

 curved. 



The radials are concealed in the median line, but are slightly visible in the inter- 

 radial angles. The IB^ are very short, oblong, five or six times as broad as long, very 

 closely united with the IBr 2 (axillary), which is triangular, twice as broad as long. 



Arms 10, 45 mm. long. The brachials resemble those of C. hispida. The ossicles 

 of the division series and brachials have their distal borders armed with very long 

 fine spines. 



The segments of the pinnules are exceedingly spinous, the third with a slight, 

 very spinous carination. 



Notes. In the specimen from Dr. Sixten Bock's station 8 the cirri are about XX, 

 12-13, from 5 to 5.5 mm. long. The second segment is twice as long as broad, the 

 third is three times as long as broad, the fourth is twice as long as broad, and the 

 antepenultimate is a little longer than broad. Some of the apical cirri are very small, 

 only 2 mm. long with 9 segments. In these the antepenultimate segment is half again 

 as long as broad. 



The IBr! is five times as broad as long. The IBr 2 (axillary) is triangular, twice 

 as broad as long. 



The 10 arms are between 15 and 20 mm. in length. The first brachial is three 

 times as broad as long. The second brachial is three times as broad as the outer, 

 and five times as broad as the inner length. 



The intersyzygial interval is 3 muscular articulations. 



PI is 5 mm. long and is composed of about 24 segments, of which 10 bear teeth 

 and take part in the formation of the comb. P 3 is 3.5 mm. long with 17 segments, 

 of which 8 bear teeth. Combs are found only on P,, P 2 , and P 3 . P 4 is 3.5 mm. long 

 with 11 segments. The pinnule segments are stout, smooth, and somewhat swollen. 



In the specimen from Mortensen's station 7 the centrodorsal is strongly flattened, 

 2.5 mm. in diameter. The cirri are XXIV, 12-13, from 6 to 7 mm. in length, in an 



