128 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The arms are 20-80 (ussally 30-40) in number, 140 mm. long. The first brachials 

 are usually rather large, sometimes nearly as long exteriorly as broad, interiorly 

 united in the proximal half, diverging in almost a straight line in the distal. There 

 is a considerable diversity in size, some first brachials being very short, while most of 

 them are about twice as broad as long exteriorly. The second brachials are nearly 

 oblong, about twice as broad as long. The first syzygial pair (composed of brachials 

 3+4) is oblong, somewhat less than twice as broad as long. The next six or seven 

 brachials are oblong, about twice as broad as long, those following becoming wedge- 

 shaped and then almost triangular, about twice as broad as long, and slowly less and 

 less obliquely wedge-shaped and very gradually increasing in length so that the termi- 

 nal brachials are wedge-shaped, about as long as broad or rather longer, with rather 

 prominent articulations. The second and following brachials have projecting and 

 finely spinous distal edges. 



Syzygies occur between brachials 3+4, again from between brachials 13 + 14 

 to between brachials 17 + 18 (with rarely an additional one between brachials 9 + 10), 

 and distally at intervals of from 3 to 13 (usually 6-8) muscular articulations. 



The lower pinnules are very slender and flagellate. P t is 15 to 20 mm. in length, 

 very delicate, with about 60 segments of which the first five are broad and are pro- 

 vided with a dorsal carinate process and the remainder are about as long as broad. 

 P 2 is longer, about 22 mm. in length, and slightly stouter, with the same number of 

 segments of which the first five are modified as in Pj and the remainder are about as 

 long as broad. P 3 is similar to P 2 and is of about the same length. The following 

 pinnules decrease gradually in length, in basal stoutness, and in the number of their 

 component segments, P ( being 12 mm. long with 30 segments of which those in the 

 proximal third are similar to those of the second and third pinnules, and those in the 

 distal portion are longer than broad, becoming about twice as long as broad terminally, 

 and PIJ being 8 mm. long, with about 20 segments, of which the first two are not quite 

 so long as broad, the third and fourth are about as long as broad, and the following 

 become progressively elongated and about twice as long as broad distally. The 

 distal pinnules are very slender, 9 mm. long with about 30 segments of which the 

 first is wedge-shaped, not so long as broad, the second is trapezoidal, about as long 

 as its greater width, the third is longer than broad, and the remainder are about 

 twice as long as broad. The pinnule segments have slightly projecting and very finely 

 spinous distal ends. 



Notes. The larger of the two specimens from Rotti Strait is rather small and 

 slender, with about 30 arms, which are about 130 mm. long; the arms are arranged in 

 2, 1, 1, 2 order. The other specimen from Rotti Strait is very small and much broken; 

 it is apparently undergoing adolescent autotomy. 



The specimen from the Danish Expedition to the Kei Islands station 27 is young 

 with 14 very slender arms 70 mm. long. One ray bears one IIBr series, which carries 

 2 IIIBr series, and another ray has one IIBr series. 



The specimen from off southern Annam is a slender example with about 20 arms, 

 about 130 mm. long. The longest cirri have 22 or 23 segments. The two youngest 

 cirri, at the periphery of the centrodorsal, differ from the others in lacking the strongly 

 produced and everted distal ends of the segments, which gives them quite a distinctive 

 aspect; they are also not so strongly curved as are the other cirri. 



