220 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



as long, the second is about twice as broad as long, and those following increase in 

 length so that the terminal are nearly or quite three times as long as broad. From the 

 third onward the distal edges of the segments are slightly produced and finely spinous, 

 especially at the prismatic angles. P 4 is 3 mm. long with 13 segments, slightly more 

 slender than P 3 and less sharply prismatic. It resembles P 3 , but the distal edges of 

 the segments are more strongly produced and are coarsely dentate. The pinnules 

 following resemble P 4 but are somewhat more slender with longer segments which have 

 more strongly produced and more strongly dentate distal ends. 



The distal pinnules are 5.3 mm. long, very slender, with 20 segments of which 

 those beyond the fourth are about three times as long as broad and have somewhat 

 expanded ends. The last segment bears three strong hooks, one terminal and two 

 lateral. 



The specimen described is from Singapore. 



Notes. In one of the specimens from Hong Kong the centrodorsal is discoidal 

 with the broad dorsal pole slightly less in diameter than the base, circular, and flat 

 with an abruptly raised narrow run. The sides are slightly concave and are entirely 

 occupied by a single perfectly regular row of 20 almost oblong cirrus sockets which 

 are about three times as high as broad. The proximal edge of the centrodorsal is 

 slightly produced so that each cirrus socket, on the end toward the radials, has an 

 arched rim extending out over it. The cirri are XX, 21-23. The IBr t may be unmodi- 

 fied or may bear near the distal end a high abrupt tubercle with a rounded apex, or 

 even more or less capitate. The IBr 2 (axillaries) may be plain, or may bear in the 

 middle of the proximal edge a tubercle similar to that on the distal edge of the IBr I; 

 but smaller. The middle of the distal edges are abruptly raised into a more or less 

 prominent tubercle, which may be lacking on one side. The central portion of the 

 first 9 to 13 brachials is abruptly raised and everted so that the proximal portion of 

 the arm is very strongly serrate in lateral view. The brachials succeeding have the 

 entire distal edge strongly produced and finely spinous, this feature dying away and 

 finally disappearing at about the middle of the arm. P 2 has 13-15 segments which 

 have the prismatic angles on the distal ends produced and spinous. P 3 may resemble 

 P 2 , but is usually like P 4 . 



A similar specimen has arms about 65 mm. long. 



Another specimen has the segments of P 2 furnished with unusually prominent, 

 abruptly raised, high, and distally dentate processes. 



The specimen from San Bernardino Strait is small with the arms 37 mm. long. 



The specimen from Albatross station 5248 is small and mutilated. 



One of the specimens from off Jolo in about 36-55 meters has the arms 60 mm. long. 

 The cirri are XVI, 16-18, from 8 to 10 mm. long. The centrodorsal is discoidal with a 

 circular outline and a flat dorsal pole 2 mm. in diameter. PI is 4.5-5 mm. long with 

 14 or 15 segments, somewhat stouter at the base than usual, with the segments from the 

 third onward progressively more sharply carinate, and those in the distal half flattened. 

 P 2 is 6 mm. long with 13 or 14 segments, stouter than usual, with the processes at the 

 distal angles rather strongly developed. P a resembles P 2 , but is much smaller. 



A similar specimen has the arms 45 mm. long. 



A third specimen has the arms about 40 mm. long; P 2 is not quite so stout. 



