124 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



succeeding slowly decrease in length, those in the outer part of the cirri being about as 

 long as broad. The sixth or seventh and following segments bear long sharp dorsal 

 spines. The opposing spine is nearly as long as the width of the penultimate segment, 

 and is slender, sharp, and erect. The terminal claw is twice as long as the penultimate 

 segment and is strongly curved proximally, becoming straighter distally. The cirrus 

 segments are somewhat constricted centrally with slightly expanded and overlapping 

 distal ends. 



The disk is covered with rounded isolated flat plates and is thickly plated along 

 the ambulacral grooves and on the anal tube. 



The radials are short, about four times as broad as long, sometimes with a faintly 

 marked row of small tubercles along the distal border. 



The IBr! are about as long as the radials, oblong, four times as broad as long. 

 The IBr 2 (axillaries) are pentagonal, twice as broad as long. The elements of the 

 IBr series are united by a curious syzygy (pseudosyzygy) in which the outer portion 

 of the joint face for about one-half the distance from the periphery to the rim of the 

 central canal is marked with radiating ridges, the space within this border being 

 smooth and flat except for the low and narrow synarthrial longitudinal ridge. 



The 10 arms are 50 mm. long. The first two brachials are subequal, slightly 

 wedge-shaped, twice as broad as the exterior length. The first syzygial parr (com- 

 posed of brachials 3+4) is slightly longer interiorly than exteriorly, and twice as 

 broad as the exterior length. The next four brachials are oblong, slightly over twice 

 as broad as long, and those following become obliquely wedge-shaped, about as long 

 as broad, after the proximal third of the arm less obliquely wedge-shaped and about 

 as long as broad, and terminally slightly longer than broad. The brachials after the 

 tenth have somewhat produced distal ends. 



Syzygies occur between brachials 3+4, again most commonly between brachials 

 13 + 14, and distally at intervals of 6-10 (.usually 8 or 9) muscular articulations. 



P, is 8 mm. long, moderately stout basally but tapering rapidly in the proximal 

 half and becoming very slender and thread-like distally, with about 25 segments of 

 which the first is about twice as broad as long and those following gradually increase 

 in length becoming about as long as broad on the fifth and following and slightly 

 longer than broad terminally. The first three to five segments are slightly carinate 

 and rounded prismatic. P 2 is about 10 mm. long, stouter than Pj but otherwise 

 similar to it, with about 30 segments. P 3 is 3.5 mm. long, small, weak, and slender, 

 and becoming exceedingly slender in its distal half. P 4 is similar, 3 mm. long. P 6 is 

 2 mm. long, not tapering so rapidly as the preceding pinnules and therefore appearing 

 somewhat stouter, with 10 segments. The following pinnules are similar, soon slowly 

 increasing in length and slenderness. The distal pinnules are very slender, 6 mm. 

 long, with 15 or 16 segments. 



Locality. Albatross station 5276; China Sea, in the vicinity of southern Luzon; 

 Malavatuan Island (N. W.) bearing N. 61 30' E., 6.5 miles distant (lat. 1349'15" N., 

 long. 12014'45" E.); 33 meters; shells, pebbles and sand; July 17, 1908 [A. H. Clark, 

 1911, 1912, 1918; Eeichensperger, 1913] (1, U.S.N.M., 27489). 



Remarks. This species is as yet known only from the single specimen dredged 

 by the Albatross in 1908. 



