448 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



are XV, 41-46, 14-18 mm. long and resemble the apical cirri of older individuals. 

 The radials are as long as broad, or half again as broad as long, and have a dorsal 

 longitudinal crest. The arm bases are flattened laterally as far as the fourth brachial. 

 The 10 arms are 25 mm. long. From the fiftieth onward the brachials develop dorsal 

 spines. As a result of the shortness of the arms only a small part of the outer portion 

 bears spines. The distal intersyzygial interval is 3-6 (-9) muscular articulations. 

 Pi is 2.5 mm. long with 8-9 segments. P2 is 3 mm. long with 9 segments. P3 is 2.5 

 mm. long with 8 segments. The distal pinnules are 5.5-6 mm. long with 15-16 

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



In a specimen from Bock's station 47 the cirri are XIII, 42-46, 15-23 mm. long 

 The radials are half again as broad as long, with a dorsal crest. The 12 arms are 

 35 mm. long. The distal intersyzygial interval is 5-6 muscular articulations. The 

 distal pinnules are 7 mm. long with 17 segments which are twice as long as broad. 

 In another specimen from station 47 the cirri are XIV, 27-34, 5-9 mm. long. 

 The radials are half again as long as broad. There is an indistinct median crest on 

 the elements of the IBr series. The 10 arms are 20 mm. long. P, is 3 mm. long 

 with 8 segments. P2 is 2.5 mm. long with 8 segments. The distal pinnules are 5.5 

 mm. long with 15 segments which are two and one-half times as long as broad. 



In a third specimen from station 47 the cirri are XII, 25-36, 7 mm. long. The 

 radials are half again as long as broad. The 10 arms are 12 mm. long. The distal 

 intersyzygial interval is 5 muscular articulations. Pi has 7 segments. P2 is 2 mm. 

 long with 8 segments. The distal pinnules are 5 mm. long with 11 segments which 

 are from two and one-half to three times as long as broad. The orals have been 

 resorbed. 



A fourth specimen from station 47 has the cirri XIV, 12 mm. long. The radials 

 are as long as broad. The elements of the IBr series are rather smooth. The 10 

 arms are 25 mm. long. Pi is 3 mm. long with 10 segments. P2 is 3.5 mm. long with 

 10 segments. P3 is 3.5+ mm. long with 9 segments. 



In another specimen from station 47 the cirri are X, 20-32, 4-10 mm. long. 

 The radials are about as long as broad. The elements of the IBr series bear a crest 

 with slight mediodorsal tubercles. The 10 arms are 15 mm. long. Pi is 2 mm. long 

 with 9 segments. P2 is 1 .8 mm. long with 9 segments, absent from some arms. P3 is 

 2.5 mm. long with 8-9 segments. The distal pinnules are 4 mm. long with 12 seg- 

 ments which are two and one-half times as long as broad. The orals are thin, but well 

 preserved. 



In a specimen from Bock's station 53 the cirri are XXI, 69-85, 45-70 mm. long. 

 The radials are 5 times as broad as long. The 12 arms are 90 mm. long. The brachi- 

 als develop dorsal spines from the forty-fifth onward. The distal intersyzygial 

 interval is 4-7 muscular articulations. The distal pinnules are 11.5-12.5 mm. long 

 with 19-22 segments which are twice as long as broad. 



In another specimen from station 53 the centrodorsal has an arched and rounded 

 dorsal pole. The cirri are XVI, 62-81, 40-65 mm. long. The proximal and distal 

 series of prominences on the cirri are not distinctly separated. The radials are 4 

 times as broad as long, with a dorsal spine or crest. The IIBr series are always 2. 

 There is a pair of new regenerated arms of somewhat unequal size. The 13 arms are 

 80 mm. long. The brachials develop dorsal spines from about the fiftieth onward. 



