A MONOGRAPH OF THE EXISTING CRINOIDS 217 



almost triangular, about three times as broad as long, then less obliquely wedge- 

 shaped, and almost short oblong or discoidal in the outer half of the arm, though 

 never regularly short discoidal as in Himerometra. The brachials are slightly over- 

 lapping. 



On an arm arising from a IBr axillary Pi is 9 mm. long, moderately stout basally 

 but tapering rapidly and becoming slender and almost flagellate in its distal half. 

 It is composed of 28 segments of which the first is large and broad, about twice as 

 broad as long, the second is smaller but similarly proportioned, the third is slightly 

 longer, and those following are similar to the third, but become short in the terminal 

 10 or 12. The larger proximal segments are moderately carinate, the carination 

 being somewhat roughened and finely tubercular. P 2 is 13 mm. long, stout basally 

 and tapering to a slender tip, with 31 segments of which those in the proximal half 

 are not so long as broad and rather strongly carinate, the following are about as long 

 as broad with d imi nishing carination, and the terminal are short. P 3 is 21 mm. long, 

 stouter than P 2 , tapering evenly to a slender tip, with 38 segments most of which 

 are about as long as broad, rather shorter basally and rather longer distally. The 

 segments in the proximal half have somewhat tubercular carinate processes which, 

 however, are never very large, and there is a prominent ridge running along the 

 entire pinnule distal to the median outer line. P 4 is 25 mm. long, about as stout 

 basally as P 3 and similar to it, with 38 segments. P 6 is 14 mm. long, about as stout 

 basally as P t but tapering more evenly and not so slender distally, with 25 segments, 

 most of which are not quite so long as broad. P D is like P, as described, though some- 

 what smaller. On arms springing from a IIIBr axillary P! is like P, as described, 

 P 2 is 17 mm. long, like P 2 as described, with 35 segments, P 3 is 28 mm. long, with 38 

 segments, resembling P 4 as described, and P 4 is 14 mm. long resembling P 5 as de- 

 scribed. The carination of the proximal pinnule segments dies away after about Pi 6 . 

 The distal pinnules are small and very delicate, 7 mm. long. 



The color in alcohol is uniform dark brown. 



Notes. — In the specimen collected by the Investigator in the Andaman Islands 

 the cirri are X, 43 + , 50 mm. long. There are 22 arms 120 mm. long. All the IIBr 

 series are present. The two IIIBr series are 2, developed internally. The color is 

 whitish, the articulations purple, the arms crossed by regular broad deep purple 

 bands; the cirri are white, each segment with a saddle of purple ventraUy, becoming 

 rusty brown at the tip. 



The specimen from Ye, Burma, is an especially fine example of the species. The 

 cirri are XII, 42 + , 43 + , and 44 + . There are 36 arms 90 mm. long. The IIBr series 

 are all 4(3+4), and the IIIBr series are all 2; the 10 internal IIIBr series are all 

 present, and in addition there are six external IIIBr series. The synarthrial tubercles 

 are prominent. 



In the specimen from the Mergui Archipelago the cirri are XIII, 43-44, 40 mm. 

 long. There are 31 arms 120 mm. long. The IIBr series are all present, and all are 

 4(3+4). The 10 internal IIIBr series are all present, and there is an additional ex- 

 ternal one. Two of the IIIBr series are 4(3+4), the other nine being 2. 



208244—40 15 



