70 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



cirri are XIX, 20-25. The cirri in the apical row have 20-23 and those in the prox- 

 imal row 23-25 segments. In a cirrus from the apical row with 20 segments the proxi- 

 mal ridge begins on the fourth and the distal on the eighth. In another cirrus from 

 the same row with 20 segments the proximal ridge begins on the fifth and the distal 

 on the fourth. In a cirrus from the proximal row with 23 segments the proximal 

 ridge begins on the fifth and the distal on the fourth. P! is 9.5 mm. long with 15-16 

 segments. P 2 is 9 mm. long with 15 segments. P 3 is 7 mm. long with 13 segments. 

 P 4 is 6.5 mm. long with 18 segments. P a is 9.5 mm. long with 14 segments. P b is 

 8.5 mm. long with 14 segments. 



In a second specimen from Mjoberg's station 10 the arms are 50 mm. long. The 

 cirri are XXII, 19-27, those in the proximal row having 25-27 segments. P! has 

 15or 16 segments. P 2 is 11 mm. long with 14 or 15 segments. P 3 has 11+ segments. 

 P 4 has 16 segments. P b has 14 and P d 16 segments. 



In a third specimen from station 10 the arms are 60 mm. long. The cirri are 

 XXXI (six empty sockets and three young regenerating cirri), 22-26, those in the 

 apical row having 22-26 and those in the proximal row 24-26 segments. In a cirrus 

 in the apical row with 26 segments the proximal ridge begins on the fifth and the 

 distal on the eighth. In a cirrus in the proximal row with 25 segments the proximal 

 ridge begins on the fifth and the distal on the thirteenth. In another cirrus in the 

 proximal row with 25 segments the proximal ridge begins on the fourth and the distal 

 on the sixth. In a third cirrus from the proximal row with 25 segments both the 

 proximal and distal ridges begin on the fifth. P b regenerating from the eighth seg- 

 ment, is 10 mm. long with 14 segments. P. is 9 mm. long with 13 segments. P 4 is 

 8.5 mm. long with 19 segments. P 6 is 7 mm. long with 18 segments. P 6 is 9 mm. 

 long with 25 segments. P a is 9 mm. long with 12 segments. P b is 8 mm. long with 

 12 segments. P c is 8 mm. long with 14 segments. P, is 9 mm. long with 22 segments. 



In a fourth specimen from station 10 the arms are about 60 mm. long. The cirri 

 are XXIV (two being small), 21-27, those in the apical row having 21-24, and those 

 in the proximal row 25-27 segments. In the cirri of the apical row there are no 

 dorsal spines, or only slightly indicated ones on some few segments from about the 

 eighteenth. In a cirrus of the proximal row with 27 segments the proximal ridge 

 begins on the seventh and the distal on the thirteenth. P! is about 11 mm. long 

 with 17 segments. P 2 is of about the same length with 15 segments. P 3 is shorter 

 with 14 segments. P tt is 11.5 mm. long with 16 segments. P b is 10 mm. long with 

 14 segments. P d is 7 mm. long with 17 segments. 



In a fifth specimen from station 10 the arms are 60 mm. long. The cirri are 

 XXIII, 21-28, those about the dorsal pole having 21-25 and those about the run of 

 the centrodorsal 23-28 segments. The cirri are, as described by Gislen, in a single 

 row, but their places of attachment usually correspond to an apical and a proximal 

 row. Five regenerating cirri are included in the number given. In a cirrus from 

 the apical row with 24 segments the proximal ridge begins on the sixth and the distal 

 on the tenth. In another from the same row with 25 segments the proximal ridge 

 begins on the fourth and the distal on the tenth. In a cirrus from the proximal row 

 with 23 segments the proximal ridge begins on the fourth and the distal on the nil th. 

 In another from tho same row with 25 segments the proximal ridge begins on the 

 second and the distal on the eleventh. P 1 is 10 mm. long with 13 segments. P a is 



