418 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



specimen from New Harbour and in the Copenhagen specimen from Fiji, the general 

 effect is of 2 stout arm trunks giving off arms which are alternately internal and 

 external. But while in the specimens from New Harbour and Fiji there are 2 of 

 these arm trunks arising from each IIBr axillary, and therefore 4 to each postradial 

 series, in the specimen under consideration the arm trunks arise from the IBr axillaries, 

 and there are therefore only 2 to each ray. One of the IIIBr series is 4 (3 + 4). 

 There are 8 IVBr series, all of 2 ossicles and all internally developed. There is a 

 single VBr 2 series. 



The elements of the IIIBr series are united by what appears to be a close syn- 

 arthry which has not become transformed into a syzygy. This is probably what 

 misled Carpenter and caused him to place this species in the Parvicirra group instead 

 of in the Typica group, where it belongs. 



The division series are broad, and the interradial perisomic areas are completely 

 and heavily plated. 



There were about XV cirri present in life, the stumps remaining showing that 

 the cirri were stout. 



The specimen from Siboga station 89 has the arms 80 mm. long. There are 5 or 

 6 postradial axillaries. 



The example from Maumeri has the arms 75 mm. long and 4 or 5 postradial 

 axillaries. 



The specimens from Ternate are both small. 



The individual collected by the Siboga at Amboina has the arms 85 mm. long and 

 5 or 6 postradial axillaries. 



Hartlaub remarked that in neither of the specimens which were collected by 

 Doctor Brock at Amboina is there a trace of cirri on the centrodorsal, the latter lying 

 almost beneath the level of the radial ring. 



The rays divide usually five times, and never more than seven times. In one 

 specimen all the IIBr series are 4 (3 + 4) ; in the other 8 of the IIBr series are 4 (3 + 4) 

 and 2 are 2. In the first specimen all the IIIBr series are 2, while in the second one of 

 the rays has the 2 outermost IIIBr series 4 (3 + 4), but all the others are 2. In the 

 first specimen 18 out of the 20 IIIBr series bear interiorly, in reference to the IIBr 

 series, a IVBr 2 series and outwardly an undivided arm. The other 2 bear an external 

 as well as an internal IVBr series, which in one case is 4 (3 + 4) and in the other case 2. 

 In the second specimen 12 of the IIIBr series bear a IVBr 2 series internally in refer- 

 ence to the IIBr series and externally an undivided arm. Two of the IIIBr series, 

 both external in reference to the IBr series, bear 2 undivided arms, and 6 bear a IVBr 

 2 series internally and a IVBr 4 (3 + 4) series externally. 



Hartlaub noted that the IVBr series may be 4 (3 + 4), or sometimes 3. He also 

 remarked that when the IIBr series, which are normally 4 (3 + 4), are of 2 ossicles the 

 outer division series also are irregular. 



The pinnules of the first 2 pairs are of almost equal length, but those of the second 

 pair are often the longer. The pinnules of the 3 following pairs are markedly shorter 

 and are exceedingly slender. Hartlaub said that in this respect his specimens seemed 

 not to be wholly in agreement with those recorded by Carpenter, for the latter wrote 

 that those of the first pair are the longest, those of the second pair shorter, and the 

 length of those following decreases. 



