148 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The extent of the eversion of the distal edges of the brachials varies on different 

 arms. Usually it ends at the twenty-fourth brachial, the arm being smooth from that 

 point onward, but on one arm the last trace of the eversion is at about the thirty-fifth 

 brachial. 



Pi is 14 mm. long with 35 segments. P2 is 10 mm. long with 27 segments. P3 

 is about as long as P2. P4 is 6 mm. long with 17 segments. P5 is somewhat shorter. 

 On the following pinnules the length slowly increases. 



On the outer side of the arms only the first 3 pinnules are flagellate. All 3 have 

 prominent combs, that of Pi extending from the twentieth to the thirty-second 

 segments, and that of P3 extending from the fifteenth segment to the twenty-fifth 

 (terminal). The segments in the proximal half of the first 3 pinnules are only slightly 

 broader than those in the following shorter pinnules. The 2 basal segments have no 

 processes nor spines. 



From P4 onward the segments following the second increase markedly in size and 

 are surrounded by skinlike perisome. From the third onward the segments of all the 

 pinnules bear a spinous carinate process on the side toward the arm. On the flagellate 

 first 3 pinnules these processes are only occasional on the third-sixth or -seventh 

 segments, and when present are only moderately developed. On the following 

 pinnules the strength of these processes markedly increases, and on P7 or Pg they 

 are already as broad as the enth-e segment that bears them. 



The processes on the pinnule segments are strongest in the region where the 

 eversion of the distal edges of the brachials is also strongest. On the pinnule of the 

 fifteenth brachial the processes extend from the third to the eleventh segments. On 

 the outer pinnules, from about the forty-fifth brachial on, they extend only from the 

 third to about the sixth, and their development here is much less. 



The length of the pinnule of the eightieth brachial reaches 10 mm. These distal 

 pinnules are flageUate and are composed of uniformly short segments, of which only 

 the 2 basal are enlarged. There are feebly developed processes from the third to 

 about the twelfth segments. 



The color is whitish, with the syzygial pairs brownish, and sometimes with a dark 

 longitudinal band on the dorsal surface of the arms. The central portion, as far as 

 the third brachials, is darker. The cirri are light. 



A 15-armed specimen from Blake station 262 has unusually short brachials. 



A 20-armed specimen from Blake station 249 has the varietal characters developed 

 to an extreme degree, while a 17-armed specimen from the same station is intermediate. 



Localities. —Blake station 106; Old Bahama Channel (lat. 22° 23' 45" N., long. 

 77° 38' 20" W.); 493 meters; fine white sand; December 16, 1878 [Hartlaub, 1912]. 



Albatross station 2331; off Habana, Cuba (lat. 23° 10' 31" N., long. 82° 19' 55" 

 W.); 208 meters; coral bottom; January 17, 1885 (2, U.S.N.M., 34483). 



Albatross station 2334; off Habana, Cuba (lat. 23° 10' 42" N., long. 82° 18' 24" 

 W.); 122 meters; white coral; January 19, 1885 (2, U.S.N. M., 34614). 



Albatross station 2321; off Habana, Cuba (lat. 23° 10' 54" N., long. 82° 18' 00" 

 W.); 420 meters; fine gray sand; January 17, 1885 [A. H. Clark, 1917] (2, U.S.N.M., 

 34482). PI. 7, fig. 22. 



Albatross stations 2319-2350; off Habana, Cuba; 60-510 meters; Januarv 17-20, 

 1885 (2, U.S.N.M., 34885, 36093). 



