686 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



YOUNG OF COMASTER SERRATA 



Locality. — East of Chichijima; 146 meters; July 31, 1914. 



Notes. — The cirri are XIV, 9, 2 mm. long. The radials are four times as broad 

 as long. The IBri are three times as broad as long. The 10 arms are 10 mm. long. 

 The brachials are strongly serrate and everted. Pi and P2 (if present), with a short 

 high comb; P3 and P4 absent. The mouth is central. In other respects this indi- 

 vidual resembles the specimen of Comaster serrata taken at the same station (45). 



YOUNG PROBABLY OF COMANTHERIA DELICATA 



Locality. — East of the channel; 146 meters; August 1, 1914. 



Notes. — The cirri are XIII, 9, from 2.5 to 3 mm. long. The third and fourth 

 segments are two and one-half times as long as broad. 



The 10 arms are from 15 to 20 mm. long. The arm bases are rather strongly 

 serrate. There is a close synarthry between the first 2 brachials. The intersyzygial 

 interval is 3 muscular articulations. Pj and P2 (when present) bear a short high 

 "omb of 4-5 teeth. P3 is absent. None of the distal pinnules bear combs. 



The disk is 1.2 mm. in diameter.- The mouth is central. The anal tube is 

 short and shaped like a wart. The anal interradias has calcareous plates in the 

 perisome, but no papillae. 



ioca/ii?/.— Northwest of Ototojima; 128 meters; July 31, 1924. 



Notes.— The cirri are XIII, 9-10, from 3 to 4 mm. long. The third-fifth seg- 

 ments are the longest — twice as long as broad. 



The radials are seven times as broad as long. The IBri are three times as broad 

 as long, free laterally, closely articulated with the axillary, which is pentagonal and 

 half again as broad as long. The first brachials are basally united interiorly. The 

 10 arms are 22 mm. long. The brachials are rather long, with their distal ends 

 somewhat everted and spiny. Proximally the arms are well separated. The inter- 

 syzygial interval is 3 muscular articulations. 



Pi is 2.5 mm. long with 21 segments, of which 5 bear large teeth in height equal 

 to three times the width of the segment bearing them. Pj, P3, and sometimes P4 are 

 absent. The pinnule segments are very spiny. The distal pinnules are 3 mm. long 

 and are composed of 14 segments, of which the third and following are four times as 

 long as broad. There are no combs on the distal pinnules. 



The disk is 3 mm. in diameter and reaches to the second brachial. The anal 

 tube is subcentral, swoUen, and papillated. 



YOUNG OF A SPECIES OF COMANTHERIA 



Locality.— East of Chichijima; 146 meters; July 31, 1914. 



Notes. — The cirri are XIV, 11-17, from 3 to 6.5 mm. long. The fourth segment 

 is the longest, from one-third to one-half again as long as broad. From the seventh 

 segment onward subterminal dorsal prominences occur. The opposing spine in 

 height is equal to one-third the width of the penidtimate segment, and is stouter and 

 more sharply pointed than the preceding processes. The cirri of the dorsal row are 

 considerably more deUcate. 



