154 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



short, rarely reaching to more than one-third the lateral width of the penultimate 

 segment m height. The terminal claw is frojn half again to twice as long as the 

 penultimate segment, stout, abruptly curved basally but becoming straighter distally. 



Another specimen from Singapore has about 70 arms which are about 80 mm. long, 

 and the cu-ri XVI, 25 mm. long. The color is light brownish with the distal two- 

 thirds of the cirri hghter. 



A typical specimen from Singapore has about 100 arms 95 mm. long. 



A small specimen from Singapore has 35 arms SO mm. long. The anal area, 

 which occupies most of the disk, is rather thickly set with small concretions most of 

 which are rounded with a depressed center, though some are U-shaped, and some are 

 confluent with those adjacent. This individual is practically intermediate between 

 sentosa and multiradiata. 



One of the samples from Singapore with about 75 arms 100 mm. in length and the 

 disk 15 mm. in diameter has a large Ophiomaza lying on the disk. 



One of the other specimens from Singapore has about 70 arms. 



Worthy of note is still another which is nearly white wdth the pinnules nearly 

 black in the basal tliird and bright green in the distal two-thirds. 



One of the specimens from Sebesi Strait is large, with 80 arms. The other has 50 

 arms; of the 10 IIBr series 7 are 4 (3 + 4), 1 is 3 (2 + 3), 1 is 2, and 1 is 8 (3 + 4, 7 + 8). 



The example from north of western Java is typical, with 61 arms. 



The spechnen from Billiton recorded by Professor Koehler has 56 arms. There 

 are 25-32 cirrus segments. The radials are clearly visible. The distal edges of the 

 elements of the division series and the first 2 or 3 brachials are not furnished with 

 spines; these do not appear imtil beyond the third or fourth brachials. 



The specimen from Siboga station 299 (Rotti) has 56 arms 110 mm. long; the 

 cirri have 29-30 segments and are from 25 to 30 mm. long. 



Dr. P. H. Carpenter's description of this species was based on the two specimens 

 collected by the Challenger at Banda and one from the Moluccas collected by Quoy 

 and Gaimard. As noted by him the centrodorsal is a thick disk, sometimes almost 

 columnar, with the dorsal pole partially excavated. The cirri are XX-XXX, 26-40, 

 with the fifth segment usually longer than broad and the next 2 or 3 the longest, 

 least markedly so in the older cirri. The later segments are about as long as broad 

 and somewhat compressed laterally, small spines appearing near their distal edges 

 which increase in distinctness up to the penultimate. 



The radials are visible, least so in the larger specimens. The IBri are partly 

 united laterally. The division series are well separated from each other. The IIBr 

 series are 4 (3 + 4), and the IIIBr and following series are 3 (2 + 3). 



The arms are 40-65 in number 125 mm. long and are composed of 120-150 

 brachials, of which the first few are nearly oblong and those following are short 

 triangular with overlapping and coarsely spinous distal edges. From about the 

 fortieth onward, as the arms narrow, the segments become more oblong and the 

 terminal brachials are nearly as long as broad. The anterior arms may be sUghtly 

 longer than the posterior. 



Syzygies occur between brachials 2 + 3, again from between brachials 16 + 17 to 

 between brachials 31 +32, and distally at intervals of from 5 to 9 (usually 6 or 7) 

 muscular articulations. 



