114 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Gradually this crescent becomes straightened out so that beyond about the middle of 

 the cirrus each segment bears a straight median serrate transverse ridge. Viewed 

 from the ends of the segments these transverse ridges usually show a more or less con- 

 vex profile, though on some of the cirri they may be nearly straight. Distally they 

 become gradually narrower, on the antepenultimate segment being commonly repre- 

 sented by a slight median tubercle. The opposing spine is terminal or subterminal, 

 erect, in height equal to about half the distal width of the penultimate segment, 

 though sometimes longer; its base occupies nearly or quite all the dorsal surface of the 

 penultimate segment. The terminal claw is about as long as the penultimate seg- 

 ment, stout in its proximal third but slender in the distal two-thirds, which portion 

 usually is rather abruptly bent downward. 



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

 IBr t are short, about 4 times as broad as the median length, which is about one-third 

 less than the lateral length. The lateral edges are straight, and in apposition. The 

 IBr 2 (axillaries) are rhombic, broader than long. 



The 10 arms are probably between 55 mm. and 60 mm. in length. The first 

 brachials are short, trapezoidal, twice as long exteriorly as interiorly, with the interior 

 edges united for about the proximal two-thirds. The second brachials are larger and 

 irregularly quadrate. The first syzygial pair (composed of brachials 3+4) is slightly 

 longer interiorly than exteriorly, nearly or quite twice as broad as the lesser (exterior) 

 length. The next 2 brachials are slightly wedge-shaped, 3 or 4 times as long as the 

 median width, and those following becomes more and more pronouncedly wedge- 

 shaped and after the fourteenth triangular, about as long as broad, and distally 

 wedge-shaped again and slightly longer than broad. 



Syzygies occur between brachials 3+4, 13 + 14 (sometimes between brachials 

 9+10 or 10 + 11), and distally at intervals of 4-7 (usually 5) muscular articulations. 



PI is 8 mm. long with 14 segments of which the first is half again as broad as long, 

 the second is slightly trapezoidal, half again as long as the distal width, the third is 

 twice as long as broad, and the remainder are from 3 to 4 times as long as broad. 

 The seventh and following segments have very prominently everted and spinous over- 

 lapping distal ends. P 2 is 8 mm. long with 16 segments, similar to PI but with the 

 segments proportionately slightly shorter. The sixth and following have very 

 prominently everted and spinous distal edges. P 3 is 8 mm. long with 14 segments, 

 similar to P 2 . P 4 is 5 mm. long with 14 segments, similar to P 3 but with the segments, 

 especially the distal, proportionately shorter. P 6 is 6 mm. long with 16 segments of 

 which the distal become greatly elongated, and the third and following have promi- 

 nently everted and spinous distal edges. The following pinnules resemble P 6 , but 

 gradually increase in length so that the distal pinnules are 8 mm. long, composed of 17 

 segments, most of which are about twice as long as broad, with produced and spinous 

 distal edges. The 2 terminal segments of the distal pinnules are rather abruptly 

 smaller and more slender than tnose preceding. 



The color in alcohol is purple, the cirri yellow, each cirrus segment with a median 

 ventral purple saddle ; regenerated arms are yellow. 



Locality. Golden Hind; Sagami Bay, Japan (lat. 3502' N., long. 13850' E.); 

 100 meters; Alan Owston [A. H. Clark, 1908, 1909, 1912, 1915, 1916, 1918] (1, U. S. 

 N. M., 35631 [Owston Coll. No. 7036]). 



