220 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



V-shaped cleft running to the edge of the inner end of the synarthrial joint face. 

 Though the dorsal surface of the ossicle is well rounded, the distance from the central 

 canal to the median part of the dorsal edge is not so great as the distance from the 

 central canal to the inner angle. Counting the entire median length of the joint face, 

 the broadest portion is found to be scarcely more than one-third the distance from the 

 dorsal edge to the inner angle. The ossicle is laterally sharply flattened from its widest 

 point inward. The IBr 2 (axillaries) are low, rhombic, with the lateral angles truncated 

 so that the lateral angles are about as long as the lateral borders of the IBri. They are 

 twice as broad as long. There is an obscure well-rounded carination. The distal angle 

 is produced, but broad. The dorsal surface is rather strongly convex. The lower 

 portions of the axillaries are strongly produced inward so that, as in the case of the 

 IBri, the inner sides are reduced almost to apices which almost meet the similar inner 

 ends of the other axillaries. From this central point the inner face of the axillaries, 

 together with the division series, forms the platform upon which the visceral mass rests. 

 The sides of the inner half of the axillaries are sharply flattened. The IIBr series are 2, 

 similar to the IBr series but rapidly decreasing in dorsoventral width. They are sharply 

 flattened laterally for somewhat more than their inner half. 



The 19 arms are 145 mm. long. The first two brachials are flattened laterally for 

 their entire inner side, and the first syzygial pair (brachials 3+4) is flattened on the 

 inner portion of the inner side. 



P! is slender and evenly tapering, from 9 to 10 mm. long, composed of 26 to 31 

 segments, all of which are much broader than long. P% is similar but very slightly 

 stouter, of the same length or very slightly longer, with 25 segments, of which the outer- 

 most are about as long as broad. PS is 11 mm. long with 22 segments and in general 

 resembles Pa, but the segments in the distal half are about as long as broad. P^is 11 

 mm long with 20 segments which become as long as broad on the fifth or sixth and 

 slightly longer than broad terminally. P 6 is 9 mm. long with 15 segments, most of 

 which are about as long as broad. P 8 is 8 mm. long with 14 segments. P 9 is 7 mm. 

 long with 13 segments. The distal pinnules are slender, 10 mm. long with 20 segments. 

 On the genital pinnules the third-seventh segments are very slightly, almost imper- 

 ceptibly, broadened. 



The color in alcohol is brownish white, the centrodorsal and division series brownish 

 gray. 



Notes.- The specimen from Albatross station 5110 is smaller than the type speci- 

 men just described, though similar to it. It also has 19 arms. The fourth to tenth seg- 

 ments of the genital pinnules are somewhat expanded, more so than in the type speci- 

 men. 



The specimen from the South China Sea is much broken. The longest cirri are 

 42 mm. long with 19-20 segments. 



Localities. Siboga station 166; Halmahera Sea (lat. 228'30" S., long. 13103'18" 

 E.); 118 meters; hard coarse sand; August 22, 1899 [A. H. Clark, 1912, 1916, 1918; 

 Gislen, 1924, 1927, 1934] (1, Amsterdam Mus.). 



Albatross station 5110; China Sea, off southern Luzon, Philippines; Corregidor Light 

 bearing N. 20 E., 25 miles distant (lat. 1359'20" N., long. 12025'45" E.) ; 247 meters; 

 bottom temperature 15.0 C.; dark gray mud; January 5, 1908 [A. H. Clark, 1918] 

 (1, U.S.N.M., 35707). 



