660 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The 19-24 arms are about 75 mm. long. They are composed of about 100 bra- 

 chials which at first are broader than long, but become gradually longer as the arms 

 taper. The brachials have the distal border somewhat everted and overlapping. 



Syzygies occur between brachials 3 + 4, 11 + 12 (or 10+11), 16+17, 21 + 22, 

 26 + 27, 31 + 32, 36 + 37, 41+42, 46 + 47, 51 + 52, etc. 



P D is longer than the following pinnules. After a little the length of the pin- 

 nules increases again. The pinnules have about 16 segments. 



Carpenter examined Grube's types and found their characters to be in all respects 

 those of parvicirra. 



The 28 specimens from Siboga station 796 show the following characters. In 

 all of them the cirri are small and weak and irregular in distribution. 



The arms are 70 mm. long. 



There are 20 arms and VI cirri. 



There are 18 arms, one ray lacking IIBr series, 65 mm. long. The cirri are V. 



There are 18 arms 60 mm. long and IV cirri. 



There are 16 arms 55 mm. long and 1 small cirrus stump. 



There are 16 arms 55 mm. long and VI cirri. 



There are 15 arms 60 mm. long and no cirri. 



There are 15 arms 60 mm. long and V cirri. 



There are 14 arms 55 mm. long and 1 small cirrus stump. 



There are 14 arms 60 mm. long and IV rudimentary cirri. 



There are 14 arms 60 mm. long and V cirri. 



There are 15 arms 60 mm. long and 1 rudimentary cirrus. 



There are 12 arms 50 mm. long and I cirrus. 



There are 1 1 arms 55 mm. long and I cirrus. 



There are 11 arms 30 mm. long and III cirri. 



There are 10 arms 50 mm. long and VII cirri. 



There are 10 arms 45 mm. long and IV cirri. 



The remaining specimens are similar. 



The specimens from Siboga station 78 are characterized by a slender habitus, 

 few, small, and weak cirri, strongly marked "dryness," or an unusual development of 

 small spines on the pinnule segments and the distal edges of the brachials, and a 

 strong tendency to break at the articulation between the elements of the IBr series. 

 It is quite possible that these features are due, in part at least, to some peculiarity 

 of the fluid in which they happened to be preserved which induced an unusual amount 

 of shrinkage of the organic substance. They show the following features: 



There are 20 arms 60 mm. long. Of the 10 IIBr series, 8 are 4 (3 + 4) and 

 2 are 2. There are IV small cirri. 



There are 18 arms 65 mm. long. Of the 8 IIBr series, 6 are 4 (3 + 4) and 2 are 2. 

 There is I cirrus. 



There are 18 arms 45 mm. long. Eight IIBr 4 (3 + 4) series are present. There 



are III cirri. 



There are 17 arms 60 mm. long. Of the 7 IIBr series, 4 are 2 and 3 are 4 (3 + 4). 

 There are IV small cirri, 4.5 mm. in length. 



There are 13 arms 55 mm. long. Of the 3 IIBr series, 2 are 2 and 1 is 4 (3 + 4). 

 There are III small cirri. 



