144 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



The cirri are XXV-XXX, 9-11, from 3.5 to 5 mm. long. The first segment is 

 not so long as broad, the second is longer than broad, strongly constricted centrally 

 with the distal end prominent, the third is about four tunes as long as the median width 

 with the terminal fourth expanded, and the fourth is the longest, about five tunes as 

 long as the median width; the fifth is about as long as the third; the sixth is about three 

 tunes as long as the median width. The following segments decrease in length to the 

 third before the last, which is twice as long as the median width, the antepenultimate, 

 which is half again as long as broad, and the penultimate, which is slightly longer than 

 broad and bears a blunt opposing spine. The distal ends of the third and following 

 segments are expanded and produced all around into a thin transparent border that 

 overlaps the base of the segments succeeding; this becomes less prominent on the short 

 distal segments. 



The 10 arms are up to 40 mm. in length. The earlier brachials have the central 

 portion of the distal edge strongly produced and armed with several stout webbed spines. 

 Beyond the second syzygy the brachials are constricted centrally and have produced and 

 spinous distal ends. The distal brachials are much elongated and very strongly con- 

 stricted centrally; the syzygial unions are also much swollen. 



The distal intersyzygial interval is usually 2 muscular articulations. 



PI is long and slender, evenly and gradually tapering and becoming very delicate 

 distally. It is composed of 18 to 20 segments of which the first is about as long as 

 broad, the second is slightly longer than broad, the third is twice as long as the median 

 width, strongly constricted centrally, and the remainder are much elongated, 4 or 5 times 

 as long as the median width, with swollen proximal ends and the distal ends strongly 

 flaring and spinous. 



P 2 is about two thirds as long as PI and is much stouter basally, though becoming 

 very slender in the distal half. It is composed of 11 or 12 segments, of which the first 

 is short, the second is longer than broad, and the third and following are much elongated 

 with expanded and spinous distal ends. There is a long ovate gonad on the third and 

 fourth or third to fifth segments. The subsequent pinnules are similar. The lower 

 and middle pinnules have the distal ends of the segments strongly produced and armed 

 with prominent spines. The distal pinnules are very slender. 



Notes. In the specimen from Atlantis station 3412 the arms are about 30 mm. 

 long. P! is 5 mm. long, with 23 segments. P 2 is 3.5 mm., long with 9 segments and 

 bears a long fusiform gouad on the third to sixth segments. The perisome of the 

 pinnules contains short, straight, slightly curved or sinuous thorny spicules; the tenta- 

 cles contain a broad band of similar though much smaller interlaced spicules. The 

 cirri are about XXXV. 



Localities. Albatross station 2337; off Havana, Cuba (lat. 2310'39" N., long. 

 8220'21" W.); 364 meters; January 19, 1885 (1, U.S.N.M., 36213). 



Atlantis station 3412; north of Punta Alegre, Camaguey Province, Cuba (lat. 

 2249' N., long. 7848' W.) ; 429 meters; April 29, 1939 [A. H. Clark, 1940; H. L. Clark, 

 1941] (1, M.C.Z.). 



University of Iowa's Barbados- Antigua Expedition station 15; Barbados [A.H. 

 Clark, 1921, 1936] (1, the holotype, U.S.N.M., E. 4289). Type locality. 



Geographical range. Northern Cuba to Barbados. 



Bathy metrical range. From 364 to 429 meters; it probably occurs also in 

 shallower water. 



