108 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



The arms are about 120 mm. and the cirri are from 12 to 14 mm. in length in the 

 unique holotype. 



Description. The centrodorsal is hemispherical, with a rather small convex bare 

 polar area. 



The cirri are L-LXXX, 15, about 12 mm. long. The first two segments are short, 

 about twice as broad as long, the third is about a third again as long as broad, the fourth 

 and fifth, which are the longest, are about half again as long as broad, and the following 

 decrease gradually in length to the one preceding the antepenultimate which is about 

 a third again as long as broad, the last two being about half again as long as broad. 

 The opposing spine is represented by a very small terminally situated tubercle which, 

 however, may be absent. The fourth and fifth segments are very slightly constricted 

 centrally, but the remainder have almost straight edges. Up to about the sixth seg- 

 ment the cirri are circular in cross section; from that point onward they are somewhat 

 compressed laterally and appear somewhat broader in lateral view. 



The distal border of the radials is even with the edge of the centrodorsal. The 

 IBr! are very short, about five times as broad as long in the median line, narrowing 

 rapidly anteriorly, not in apposition basally. The LBr 2 (axillaries) are triangular, 

 about half again as broad as long, as broad basally as the distal ends of the radials and 

 consequently overhanging on either side the narrow distal ends of the IBri. 



The 10 arms are probably about 120 mm. long. The first brachial is very obliquely 

 wedge-shaped or almost triangular, much longer exteriorly than interiorly, just in 

 contact with that of the adjoining arm basally, the free inner borders of the two diverg- 

 ing practically in a straight line. The second brachial is irregularly quadrate, about 

 as long as the outer border of the first. The first two brachials and the IBr 2 have a 

 somewhat produced and thickened border. The synarthrial articulation between the 

 elements of the IBr series and the first two brachials rises to a moderate tubercle. The 

 first syzygial pair (composed of the third and fourth brachials) is about half again ab 

 long interiorly as exteriorly, and half again as broad as the greater length. The next 

 four brachials are oblong, about twice as broad as long, the following becoming wedge- 

 shaped and after the second syzygial pah" triangidar and about twice as broad as long, 

 later wedge-shaped again and somewhat longer. The distal portion of the arms is 

 lacking. 



Syzygies occur between brachials 3+4, 9 + 10, and 14 + 15 to 16 + 17, and distally 

 at intervals of from 3 to 7 (usually 3) muscular articulations. The distal ends of the 

 brachials following the first syzygial pair are rather prominent. 



P! is 25 mm. long, moderately stout at the base but gradually tapering and in the 

 distal half very slender and flagellate, composed of 40 segments, of which the first is 

 about as long as broad, the following gradually increase in length, and the tenth and 

 those succeeding are about half again as long as broad. The first five segments are 

 slightly constricted centrally. P 2 is 16 mm. long, similar to P : but not so stout basally, 

 with about 35 segments. P 3 is from 10 to 12 mm. long, about as stout basally as P 2 but 

 less slender and flagellate distally, tapering more evenly from the base to the tip, with 

 20 segments which resemble those of P! and P 2 ; it bears a long gonacl. P 4 and the 

 following pinnules are similar to P 3 . The gonad disappears at about the twelfth pin- 

 nule, after which the pinnules are about 15 mm. long, exceedingly slender, with about 

 35 segments, of which the first is short and crescentic, the second is irregularly quadrate, 

 about as long as its distal diameter, the third is squarish, and the following gradually 

 increase in length, in the distal half being about twice as long as broad. 



