420 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



as long. The next three brachials are oblong, slightly more than twice as broad as 

 long, those succeeding are wedge-shaped, soon becoming almost triangular, twice as 

 broad as long, distally gradually becoming less and less obliquely wedge-shaped, and 

 in the terminal portion of the arm longer, about as long as broad. 



Syzygies occur between brachials 3+4, again from between brachials 10+11 to 

 between brachials 15+16 (usually between brachials 14+15 or 15 + 16), and distally 

 at intervals of from 7 to 10 (usually 8) oblique muscular articulations. 



PI is 11.5 mm. long, slender, evenly tapering and becoming very slender distally, 

 with 23 segments of which the first is about half again as broad as long and those fol- 

 lowing gradually increase in length, becoming about as long as broad on the third and 

 twice as long as broad, or somewhat longer, distally. P 2 is much stouter than PI, 

 stiff and spinelike, 15 mm. long, with 12 segments of which the first two are subequal, 

 about half again as broad as long, the third is half again as long as broad, and the 

 remainder are about two and one-half times as long as broad. P 3 is 12 mm, long, 

 resembling P 2 , and is composed of about 10 segments, of which the distal are much 

 longer than those of the preceding pinnule. P 4 is 7 mm. long, resembling P 3 but not 

 quite so stout, and is composed of 9 segments. P 5 is smaller than P 4 basally and 

 becomes very slender distally; it is 6 mm. long and is composed of 13 segments. 

 The following pinnules resemble PS, but rapidly become less stiffened basally. The 

 distal pinnules are 9 mm. long. 



Notes. The preceding description was drawn up from the specimen from Ugi, 

 Solomon Islands, in the collection of the Australian Museum. 



In one of the specimens from Port Galera, Mindoro, with 30 arms PI is 17 mm. 

 long, with 28 segments, and is very slender and flagellate. P 2 is 23 mm. long, with 18 

 segments. P 3 is 15 mm. long, with 13 segments. P 4 is 8 mm. long, with 11 segments, 

 resembling the immediately preceding pinnules but smaller. On another arm P 2 is 

 20 mm. long, with 16 segments. P 3 is 16 mm. long, with 14 segments. P 4 is 9 mm. 

 long, with 11 segments. On a third arm P 2 is 22 mm. long, with 18 segments. P 3 is 

 16 mm. long, with 14 segments. P 4 is 9 mm. long, with 12 segments. 



Another specimen has 30 arms 135 mm. long, and the longest cirri 26 mm. long 

 with 24 segments. Two others have 30 arms 150 mm. long, and 32 arms 140 mm. 

 long. Of the remaining specimens one has 32 arms and five have 30 arms. 



The specimen from Siboga station 99 has 31 arms about 110 mm. long. The cirri 

 are XXIV, 24-29 (usually 24-26), 25 to 30 mm. in length. P! is 12 mm. long, very 

 delicate, with 20 segments, of which the outer are three times as long as broad. P 2 

 is 15 mm. long, stiff and spinelike, with 13 segments. P 3 is 14 mm. long, with 12 seg- 

 ments, and resembles P 2 . P 4 is 9 mm. long, with 10 segments, and resembles P 2 and 

 P 3 , but is proportionately smaller. P 5 is 6 mm. long, with 9 segments, and is of the 

 same character as the pinnules preceding. P 6 is weak and delicate, 4.7 mm. long, with 

 9 segments. The immediately following pinnules are similar to P. 



One of the two specimens from near Bongao has 19 arms 140 mm. long. P 2 is 18 

 mm. long, with 15-17 segments. P 3 is 10-12 mm. long, with 11-13 segments. P 4 

 resembles P 3 , but is only slightly longer than the pinnules succeeding, 7 mm. long, with 

 13 segments. All but one of the IIBr series are present. The other specimen is sim- 

 ilar. It has 20 arms, of which 8 are in process of regeneration. All the IIBr series are 

 present. 



