332 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



those of the brachials following strongly overlapping. There is no trace of carination 

 or other surface ornamentation. The arms are rather sharply compressed laterally in 

 the basal half. 



Syzygies occur between brachials 1+2 and 3+4, again from between brachials 

 7+8 to between brachials 13+14, and distally at intervals of 5-9 (usually 6 or 7) 

 muscular articulations. 



P D is 11 mm. long with 35 or more short segments of which the basal 7 or 8 have 

 broad dorsal keels which gradually die away distally, though the pinnule is sharply 

 carinate to the tip. The pinnule is broad and much flattened in the basal half, then 

 becomes gradually narrower, ending in a slender and delicate tip. PI is similar but 

 about 1 mm. shorter with about 25 segments of which the distal are proportionately 

 longer and somewhat broader. P 2 is 8 mm. long with about 20 segments which are 

 about as long as broad; the pinnule tapers evenly, the basal segments being very 

 slightly, when at all, carinate. P 3 is similar to P 2 but rather shorter with larger seg- 

 ments. The pinnules following are shorter still and have the third-fifth segments 

 laterally broadened, protecting the gonads. Distally the pinnules gradually increase 

 in length, the distal pinnules being 11-12 mm. long with about 22 segments of which 

 the first is short, the second is almost triangular, and those following are about half 

 again as long as broad; all have prominent distal edges. 



The color in alcohol is yellowish white. 



Two specimens from Albatross station 2154 described (in manuscript) under the 

 name inornata seem to belong here. The centrodorsal is flattened hemispherical with 

 the small bare polar area more or less rugose. The cirrus sockets are arranged in two 

 irregular rows, with a tendency toward two columns. 



The cirri are XX, 20, 30 mm. long, and are rather slender. The first segment is 

 short, the second is twice as broad as long, the third is nearly as long as broad, and 

 those following increase in length to the sixth which, with the remainder, is somewhat 

 over twice as long as broad. The penultimate segment is slightly less in width than 

 those preceding, though of the same proportions. The outermost six or seven segments 

 have the median portion of the distal dorsal edge slightly thickened ; the distal ends of 

 all the segments are slightly and gradually enlarged. The opposing spine is represented 

 by a small terminally situated tubercle directed obliquely forward. The terminal 

 claw is about two-thirds the length of the penultimate segment, moderately slender 

 and evenly curved. 



The ends of the basal rays are visible as prominent strongly rounded tubercles in 

 the angles of the calyx. 



The radials are just visible beyond the rim of the centrodorsal. The IBri are 

 short, about four times as broad as long. The IBr 2 (axillaries) are broadly pentagonal, 

 three times as broad as long, with the lateral borders as long as those of the IBri. The 

 IIBr series are 4(3 + 4). The IIIBr series are 2, though seldom present. The division 

 series are moderately and evenly convex dorsally, in close apposition and sharply 

 flattened laterally. P D is not visible exteriorly. 



The 18 or 19 arms are about 100 mm. long and resemble those of the specimens 

 described as imbricata. The first twelve brachials are flattened laterally. The arms 

 are evenly rounded dorsally, without ornamentation. On the fifth or sixth the brachials 

 begin to develop overlapping distal ends, which soon become prominent. 



