104 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



edge of the centrodorsal in each radial area. The cirrus sockets decrease regularly in 

 size from the marginal to those about the dorsal pole. 



The cirri are XL-L, 14-15, from 10 to 12 mm. long. The first segment is short, 

 the second is from half again to twice as long as broad, and the third to eighth are 

 greatly elongated, from four to six times as long as the median width or even longer; 

 the following segments gradually decrease in length so that the antepenultimate is 

 from two to three times as long as broad and the penultimate is of about the same 

 length or shorter, sometimes tapering distally and without an opposing spine, but 

 usually not tapering and bearing a small opposing spine. The longer cirrus segments 

 are more or less strongly constricted centrally with expanded ends. 



The distal edge of the radials is even with the margin of the centrodorsal in the 

 median line, rising slightly toward the interradial angles. The IBri are very short 

 and bandlike, depressed in the median line where they are incised by the posterior 

 process of the axillaries, in lateral contact or free basally. The IBr 2 (axillaries) are 

 rhombic, half again to twice as broad as long, with all the sides strongly concave and 

 the anterior angle produced. 



The 10 arms are from 40 to 50 mm. long. The first brachial is more than twice 

 as long exteriorly as interiorly, with the two sides converging rather strongly, and is 

 deeply incised by the posterior process of the second; interiorly adjacent first brachials 

 are just in contact basally over the anterior angle of the axillary, and their interior 

 borders diverge at somewhat more than a right angle. The second brachials are about 

 as long as broad, irregularly quadrate, with the two proximal sides rather strongly 

 concave. The first syzygial pair, composed of the third and fourth brachials, is 

 slightly longer interiorly than exteriorly, and about as broad as long exteriorly. The 

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

 triangular and about as long as broad, after the end of the proximal third of the arm 

 obliquely wedge-shaped and rather longer than broad, and very gradually increasing in 

 length distally. 



Syzygies occur between brachials 3+4, 9 + 10, 14 + 15, and distally at intervals of 

 3 muscular articulations. 



PI is 6 mm. long, moderately stout basally but evenly tapering and becoming slender 

 distally, composed of 12 to 14 segments, of which the first is twice as broad as long, the 

 second is half again as long as broad, and the third and following are from three to 

 three and a half times as long as broad, becoming slightly shorter again terminally. 

 P 2 is similar, from 3 to 5 mm. long with 9 to 11 segments, of which the first is twice as 

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

 broad, and the remainder are much elongated. The distal ends of the segments of 

 these pinnules are rather prominently spinous. 



P 3 resembles the succeeding pinnules; it is from 2 to 4 mm. long with 8 or 9 seg- 

 ments; it does not taper so rapidly as P 2 and the segments are less elongated so that 

 it appears somewhat stouter; it bears a small gonad in the distal portion, and the 

 segments have slightly overlapping and spinous distal ends. P 4 resembles P 3 . P 6 is 

 usually slightly longer with one or two more segments. The distal pinnules are about 

 6 mm. long. 



The color in alcohol is white with blotches of brown on the arms and pinnules; 

 the perisome is brown. 



