A MONOGRAPH OF THE EXISTING CRINOIDS 497 



The other specimen, which is larger, has the centrodorsal clearly stellate. 

 Koehler says that it differs from typical diraricata in two rather important features; 

 the mouth is interradial, and on almost all the raj-s the Crst pinnule is longer than 

 the second. The color is deep violet. 



In Brock's specimen from Amboina the stellate centrodorsal carries a few 

 traces of cirri and rises above the level of the radials, wliile these last lie below the 

 level of the IBr series. 



The very young specimen from the Danish expedition to the Kei Islands station 

 15 seems to represent this species. There are 19 arms about 50 mm. long. The 

 8 IIBr series present are 4 (3+4). The single IIIBr series is 2 and is internally 

 developed. The centrodorsal is greatly reduced and stellate. The specimen from 

 station 26 has about 85 arms. The 10 IIBr series are 4 (3+4) and the 20 IIIBr 

 series are 2. Of the IVBr series, 25 are 4 (3 + 4) and 15 are 2. The centrodorsal 

 is stellate and is depressed to the level of the radial pentagon. One of the specimens 

 from station 30 is small, with about 85 arms 110 mm. long. All the IIBr series are 

 4 (3 + 4). Of the IIIBr series, 11 are 2 and 7 are 4 (3 + 4). One of the IIBr series 

 gives rise to 2 undivided arms. The centrodorsal is pentagonal and is sunken to 

 the level of the radial pentagon. There is no trace of cirrus sockets on its periphery. 

 The other specimen is similar but slightly smaller, with about 65 arms which are 

 about 100 mm. long. The 10 IIBr series are 4 (3 + 4). Of the 20 IIIBr series, 12 

 are 2 and 8 are 4 (3+4). The centrodorsal is small, its dorsal surface even with 

 that of the radial pentagon, pentagonal, with a deep notch in the middle of each 

 side. 



The specimen from Toeal is pecidiar in having nine of the IIBr series 2 and only 

 one 4 (3 + 4). The 2 posterior rays are very small, the IBr axillaries being not much 

 more than one-third the width of the IBri. 



The specimen from Siboga station 257 has about 50 arms which are about 90 

 mm. long. 



The 2 similar specimens recorded by Reichensperger from the Aru Islands have 

 92 and 98 arms which are from 100 to 105 mm. long. In both the division is entirely 

 regular, all the IIBr series being 4 (3 + 4) and all the IIIBr series 2. The centro- 

 dorsal is quite stellate, with the points of the star somewhat swollen. It does not 

 project. There is no trace of cirri or of cirrus sockets. P2 is slightlj^ longer and 

 stouter than Pj. P3 is smaller and more slender. In the following pinnules the 

 segments become broader and stouter, decreasing again in the distal pinnules. The 

 disk is 30 mm. in diameter, and is naked except for a slight granulation. The color 

 in life was yellow and black in cross bands; in alcohol it is entirely a blackish gray. 



One of the specimens presumably from the vicinity of Perth, has 36 arms about 

 75 mm. long. All of the IIBr series are 4 (3 + 4). Two of the IIIBr series are 4 

 (3 + 4). There are no IVBr series. The centrodorsal is large and thin, with the 

 dorsal pole 3.5 mm. in diameter and slightly concave. The cirri are XVII, 13-14, 

 8 mm. long, arranged in a single slightly defective row. They are rather slender. 

 The color in alcohol is uniform purplish black. 



This specimen is remarkable for the exceedingly close interior union of the 

 IIIBr series. In the several extreme cases the elements of the IIIBr series and the 



