424 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



dorsally as in the specimen first described. The cirri are XXII, 66-84, 30-48 mm. 

 long. The ventral spine is developed from the fourth to the thirteenth segments. 

 The ossicles following the axillaries are basally in contact. The IBr, and IIBr, have 

 the proximal border somewhat turned outward on either side of the median line. In 

 the IIBr, this occurs only on the outer side. The IIBr series are 2. The 20 arms are 

 all broken. The brachials bear blunt dorsal spines from about the fifteenth. The 

 distal intersyzygial interval is 6-7 muscular articulations. Pj is 5 imn. long with 

 10+ segments. The disk, which is detached, is 10 mm. in diameter. 



In another specimen from Bock's station 59 the centrodorsal is 1.5 mm. high; 

 the dorsal pole has 5 indistinct radial tubercles and a slight central prominence. The 

 cirri are XV, 68-75, 32-37 mm. long; ventral spines occur on the four-tenth segments, 

 and dorsal spines from the twentieth to twenty-fifth segment onward. The 17 arms 

 are all broken. The IIBr series are 2. P, is 4 mm. long with nine segments. The 

 disk is granulated and very much incised; its longest diameter is 6 mm., its shortest 

 3 mm. Gislen said that the proximal portion of these specimens is narrow, and the 

 arms are strongly bent outward after the eighth brachial. They differ from the type 

 spechnen chiefly in having fewer arms and in being somewhat smaller. 



Of the 16 specimens from Albatross station 5414 one has 30 arms 60 nun. long and 

 the cirri 50 mm. long with 70-87 segments. Another has 20 arms 73 mm. long and the 

 cirri 77 mm. long, the longest with 100 segments; the cirri of this specimen are rather 

 stouter than those of the precedmg. Another has 20 arms 60 mm. long and the cirri 

 60 mm. long. Another has 21 arms 65 mm. long and the longest cirrus 75 mm. long 

 with 106 segments. Another has 19 arms. Another has 22 arms 75 mm. long, with 

 the longest cu-rus 80 mm. long. Another has 23 arms 65 mm. long and the cirri 70 

 mm. long. Another has 29 arms. Another has 20 ai-ms; one IIBr series is lacking, 

 but a IIIBr series is developed on one postradial series. Seven specimens have from 

 20 to 25 arms. 



Of the two specimens from Albatross station 5413 one has 20 arms 75 mm. long 

 and the cirri 80 mm. long, and the other has 21 arms 70 mm. long and the cirri 75 mm. 

 long. 



The specimen from Albatross station 5356 is small with 16 arms. 



The specimen from Albatross station 5593 has 23 arms and the longest cirrus 80 

 mm. long with 108 segments. 



In these Albatross specimens the cirri average about 5 mm. shorter than the arms, 

 though they are often the same length and may even be longer. The IIIBr series, 

 when developed, are always external, in 2,1,1,2 order. 



The specimen from the Danish Expedition to the Kei Islands station 24 has 21 

 arms about 65 mm. long; the single IIIBr series is externally developed. The cirri 

 have 64-79 segments and are 40-50 mm. long. 



Localities. — Dr. Sixten Bock's station 45 ("75"); Bonin Islands, cast of Chichi- 

 jima; 146 meters; July 31, 1914 [Gislen, 1922, 1924, 1934, 1936; Sieverts, 1932]. 



Dr. Sixten Bock's station 59 ; Bonin Islands, eastnortheast of Anojima; 183 meters ; 

 August 15, 1914 [Gisldn, 1922, 1924, 1934, 1936; Sieverts, 1932]. 



Dr. Sixten Bock's station 48; Bonin Islands, east of Cliichijima; 100 meters; 

 August 1, 1914 [Gisl6n, 1922, 1924, 1934, 1936; Sieverts, 1932]. 



