1(>-1 in l.l.KI'IX 82, UNITED STATES NATIONAL MUSEUM 



plates. The ambulacra as far as the laal axillary arc raised and strongly plated ridges, 

 lint the ambulacra of the arms and pinnules are unprotected. Sacculi are abundant, 

 lallv on the pinnules, and sometimes appear on the outer ends of the plated disk 

 ambulacra. 



penter said that three of the Challenger specimens agree very closely in their 

 general characters, though the frequency of the arm divisions, and therefore the 

 number of arms, varies considerably. All the IIBr series are 4(3+4), nearly all the 

 IIIBr .erics are 2, and IVBr series are present in each individual, and are in the 

 majority of cases '_'. 



There «ns secured, however, a fourth specimen that differed from these in many 

 points. The color of the calyx and arms is the same brownish white as in the types, 

 but the cirri have a strong reddish-brown tint (which, according to Carpenter, prob- 

 ably was purple during life) with white bands at the articulations, and the proximal 

 ossicles arc relatively shorter, though still longer than broad. The difference between 

 this specimen and die other threo is most apparent in the arm divisions. Of the 10 

 IIBr series, four are 2 and six are 4(3+4), and of the 12 IIIBr series, six are 4(3+4) 

 and six are 2. There are no IVBr series. The arms are somewhat more massive than 

 in the other specimens, and the brachials, instead of being smooth and obliquely 

 quadrate, are relatively shorter and more wedge-shaped, with a slight tendency to 

 "\ erlap, 



Bell's record from Thursday Island is based upon a detached disk. 



Doderlein recorded a specimen without a disk from Thursday Island. The cirri 

 are aboul XX, arranged in several closely crowded rows, and are composed of about 

 36 segments of which the first live are broader than long, those following are nearly 

 as broad as long, and the distal are again broader than long. Dorsal spines are de- 

 veloped from the eleventh segment onward. The IIIBr series are all 2. There are 

 no IVBr series. The color is white, the pinnules spotted and banded with purple; 

 the cirri are for the most part purple, with the basal segments white. 



Carpenter mentioned the small specimen from Torres Strait collected by Staff- 



ron R. W. Coppinger of the Alert. He said that, as it was in a somewhat muti- 

 lated condition, it was not described by Professor Bell in his report upon the Alert 

 collections, but was put aside in anticipation of the arrival of better-preserved mate- 

 rial. Carpenter said that it resembles the types of fluctuans from Challenger station 

 1 'hi in the shape of the brachials, but it has no IVBr series. It resembles the varietal 

 Challenger specimen in having purplish cirri with white bands. 



The specimen from Prince ol Wales Channel is young, with the arms 20 mm. 

 long. On one of the postradial series the original synarthry between the elements of 

 the IBr series has not as yet become transformed into a syzygy. 



The specimen from tho lagoon on Mast Head Island has 40 arms; the single 

 remaining entire cirrus has 56 segments. 



The example from Mast Head Island has about 60 arms, which are about 70 

 mm. long. Slightly more division series of 4(3+4) are present than usual. 



Of the two specimens from Port Denison, one is a fine example with 60 arms 

 about 10(1 mm. Ion-, and the cirri XIX, 45^8, from 35 to 40 mm. long. The IIBr 

 series are 4(3 + 4); the remaining division series are 2, or rarely, on the exterior of the 



