364 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



length of the 5 grooved arms is almost 150 mm., that of the 5 ungrooved arms being 

 about 120 mm. The cirri are VII, 11-12, four arranged in two interradial pairs and 

 the other three occurring singly. In the other the length of the 5 grooved arms is 

 90 mm., and that of the 5 ungrooved arms 50 mm. The cirri are VII, 11, 6 mm. 

 long, arranged as in the other. The lower pinnules are scarcely keeled. The color 

 of both is brownish. 



As described by Keichensperger the single specimen from Dobo Strait is small 

 with the 6 grooved arms 70 mm. long and the 4 ungrooved arms 45 and 50 mm. long. 

 The centrodorsal is somewhat projecting, small and rounded. The cirri are VIII, 

 11-13, 5.5 mm. long. Six of the cirri are arranged in three interradial pairs, the 

 other two occurring singly. The arms are somewhat swollen. A faint light median 

 keel runs along the dorsal surface of the brachials. Pj has the basal segments often 

 prominently keeled. 



Of the 4 specimens dredged by the Eiuleavour between Fremantle and Geraldton, 

 1 is typical with VIII cirri, 6 occurring in 3 interradial pairs and 2 singly. Another 

 has XI cirri. The cirri in the other 2 are more numerous than usual, but are evi- 

 dently undergoing reduction toward the condition normal for the species — indeed in 

 the larger the normal arrangement occurs on about four-fifths of the periphery of the 

 centrodorsal. In the largest specimen the anterior arms are about 100 mm. long. 



One of the specimens presumably from the vicinity of Perth has the anterior 

 arms 100 mm. long and the posterior arms 60 mm. long. There are 5 grooved and 

 5 ungrooved arms. The other specimen is somewhat smaller. The carination is 

 almost obsolete on the IBr series. The cirri are XIV, arranged in 5 interradial pairs 

 with 4 extra, 2 of which are only partially developed. The color is light olive brown, 

 the centrodorsal, calyx and first 2 brachials being rose colored. 



Of the 2 specimens from the Abrolhos Islands, 1 has the anterior arms 120 mm. 

 long and the posterior arms 60 mm. long. The cirri are VIII, 14-15, and are of the 

 stout type although the arms are only very slightly broadened. The color is a very 

 light brown, with the centrodorsal and most of the IBr series rose pink. The other 

 specimen differs only in having the cirri slightly more slender, XIII in number. 



The specimen from the Hamburg southwest Australia expedition station 15 has 

 the anterior arms 120 mm. long and the posterior arms 90 mm. in length. The joint 

 surfaces of the articulation between the first 2 brachials are practically indistinguish- 

 able from those of a typical syzygy. This articulation is very brittle, as in the type 

 specimen which this very closely resembles except for its larger size. The arms are 

 shghtly swollen. The ossicles of the IBr series and the bracliials have a fine narrow 

 mediodorsal ridge running the entire length of the arm as is usual in this species. 

 The cirri are V, 11-13, from 8 mm. to 9 mm. in length. 



Of the 2 specimens from the Hamburg southwest Australia expedition station 26, 

 one has the anterior arms 90 mm. long and the posterior arms 70 mm. long. All the 

 arms are grooved, but the first 10 pairs of pinnules on the posterior and the first 6 

 on the anterior arms are ungrooved. The brachial carination resembles that in the 

 other specimens. The cirri are X, 12, from 6 mm. to 7 mm. in length. 



One of the specimens from the Hamburg southwest Australia expedition station 

 19 has the anterior arms 160 mm. long and the posterior arms 85 mm. long. This is a 



