402 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



teeth on the terminal combs of the oral pinnules are low and rounded; combs do 

 not occur beyond P 3 . P 4 bears a gonad. The distal dorsal ends of the proximal 

 segments of the first 4 or 5 pairs of pinnules are prominent, giving these pinnules a 

 serrate dorsal profile basally. The distal ends of all the pinnule segments are 

 projecting and finely spinous. 



The color in alcohol is brownish yellow, with the cirri lighter and the perisome 

 darker. 



Remarks. In its long and comparatively slender cirri and rugged arm bases 

 this curious species presents a most remarkable similarity to species of the antedonid 

 genus Florometra. Indeed, it is more likely to be confused with these species than 

 with any of its close relatives. 



Notes. Dr. Torsten Gislen tentatively assigned to this species a young specimen 

 from deep water in Sagami Bay, Japan, which he described as follows: 



The cirri are XIX, 11-14, from 5 to 6 mm. in length. The fourth segment is 

 the longest, two and one-half times as long as broad; the third and fifth segments 

 are somewhat shorter. From the seventh segment onward a weak dorsal prominence 

 is developed. The terminal claw is curved and pointed and is somewhat longer 

 than the preceding segment. 



The radials are very short, five times as broad as long, in the mid-radial line con- 

 cealed by the centrodorsal. The IBr! are three times as broad as long, free laterally, 

 and united to the IBr 2 by synarthry. The IBr 2 (axillaries) are low pentagonal, 

 twice as broad as long. 



The 10 arms are 35 mm. long. The first brachials are free interiorly and, like 

 the second, somewhat shorter interiorly than exteriorly. The first 2 brachials are 

 united by a close articulation. All of the brachials after the fourth are somewhat 

 constricted centrally, with the distal edge everted and spinous. In their proximal 

 portion the arms are rather narrow and are well separated from each other. The 

 brachials distally are somewhat longer than broad. 



Syzygies occur between brachials 3 + 4, 11 + 12, 15 + 16, and distally at intervals 

 of 3 muscular articulations. 



PI is 5 mm. long and is composed of 25 segments, of which 8-10 bear teeth; the 

 tip of the pinnule is smooth, the segments not bearing teeth. P 2 and P 3 bear combs. 

 The comb of P a consists of 8 teeth. P 4 is 3 mm. long, with 11 segments and without 

 a comb. P 7 is 4.2 mm. long, with 14 segments. The distal pinnules are 5 mm. 

 long, with about 15 segments. The basal segments are short and spiny, the distal 

 longer, half again as long as broad. 



The disk is 5 mm. in diameter, swollen and somewhat elevated, without calca- 

 reous concretions, and clearly visible from the dorsal side in the broad interspaces 

 between the arms; it reaches to the fourth brachial. The mouth and anal tube are 

 subcentral, the latter being 2.5 mm. high. 



Localities. Off the Goto Islands, near Nagasaki, Japan (lat. 32 22' N., long. 

 128 42' E.); 311 meters [A. H. Clark, 1908, 1909, 1912, 1915, 1918] (1, C. M.). 

 PI. 45, figs. 136, 137. 



?Dr. Sixten Bock's expedition to Japan station 37; off Okinose, Sagami Bay; 

 731 meters; July 8, 1914 [Gislen, 1922]. 



