598 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The example from Tutuila has 20 arms about 60 mm. long. The bare dorsal 

 pole of the centrodorsal is 3 mm. in diameter. The cirri are XVIII, 12-14; the fifth 

 is a transition segment. 



The specimen from Samoa in the Berlin Museum has 26 arms about 100 mm. 

 long. Of the 10 IIBr series, 7 are 4 (3 + 4) and 3 are 2. 



Of the 2 specimens labeled Samoa in the Hamburg Museum 1 has 21 arms with 

 the single (external) IIIBr series 2, and all the other division series 4 (3 + 4). The 

 other is similar. 



Carpenter wrote that he examined 2 specimens from Peru in the Hamburg 

 Museum which he thought must be referred to parvicirra. He could find no charac- 

 ters by which he could separate them from any one of the vai'ious forms that inhabit 

 the eastern seas. One of them is very small and has lost its disk, but the other is 

 larger and more perfect, though wanting some of its arms. The mouth is not quite 

 so distinctly interradial as it is in the Philippine specimens which he described as 

 polymorpha, but there is the same dimorphism of the arms. All of the arms are 

 grooved, but the grooves on the posterior arms are much smaller and less distinct 

 than those on the anterior arms and do not extend onto the pinnules. Some of the 

 posterior arms consist of less than 50 brachials, while in the anterior arms there are 

 more than 100. The terminal ungrooved pinnules of the former are also thicker and 

 more clothed with perisome than those at the same distance from the calyx on the 

 anterior arms. He was unable to find in these specimens any trace of spherodes. 



The 4 specimens from Peru in the Hamburg Museum are all of medium size. 

 One has 21 arms. The IIBr series which bears the single (internal) IIIBr series is 2, 

 all the other division series being 4 (3+4). The cirri are IX, with some additional 

 rudimentary, 16-17. Another has 20 arms with the 10 IIBr series 4 (3 + 4) and the 

 cirri VI, 16-17. A third has 19 arms. Of the 8 IIBr series present, 5 are 4 (3 + 4) 

 and 3 are 2. A single IIIBr series is developed on the inner side of a postradial series 

 bearing 2 IIBr 2 series. The fourth specimen is rather smaller than the others. It 

 has 18 arms, 8 IIBr 4 (3 + 4) series being present. 



The specimen from Ruk has 23 arms and the cirri VIII, 11-12. The centro- 

 dorsal is especially small. 



The specimen from Port Galera, Mindoro, has 20 arms about 105 mm. in length. 

 Of the 10 IIBr series, 9 are 4 (3 + 4) and 1 is 2. The cirri are numerous and closely 

 crowded in a single irregidar row on a thin discoidal centrodorsal, about XX, 13-14, 

 strongly recurved distally. The longer proximal segments are twice as long as their 

 median width. The distal segments are broader than long and are much compressed 

 laterally, so as to appear broader than those preceding in lateral view. 



Remarks. — Dr. Clemens Hartlaub in 1891 was the first to distinguish this form 

 under the heading typus A of parvicirra. According to Hai'tlaub, typus A is charac- 

 terized by having a faii'ly large flat circular centrodorsal, with the cirri XXV and 

 relatively thick; IIIBr series are absent, or at least only very rarely present; the size 

 is markedly smaller than in typus B (true parvicirra) ; the color, in the specimens from 

 Amboina, is a fairly dark uniform chocolate brown, a color never found in typus B 

 {parvicirra). 



