A MONOGRAPH OF THE EXISTING CRINOIDS 299 



series, both internally developed. The centrodorsal has the dorsal pole slightly 

 convex, 4.5 mm. in diameter. The cirri are XVI, 28-31. 



In another specimen from station 38 the 21 slender arms are 135 mm. long. 

 Of the 10 IIBr series eight are 4(3+4) and two are 2. The two lIBr 2 series are on 

 the same postradial series; one of them bears internally a IIIBr 2 series. The centro- 

 dorsal is discoidal with the flat dorsal pole 5 mm. in diameter. The cirri are XX, 

 29-34; the segments are subequal, about twice as broad as long; there are small 

 but prominent dorsal tubercles on the last 12 to 15. P t is composed of 44 segments, 

 tapering rapidly on the first seven or eight segments and then becoming flagellate; 

 the basal segments are short, and those in the distal third are about as long as broad ; 

 the second-seventh segments are narrowly but sharply carinate. P 2 resembles PI but 

 is slightly longer and tapers more regularly so is less slender distally; the segments 

 become as long as broad on the eighth; the second-seventh segments bear a high 

 carination with a straight crest, and the second segment also has a lateral carinate 

 process. P 3 is about 18 mm. long; it is stouter than the preceding pinnules and 

 tapers more slowly; it is composed of 31 segments which become as long as broad on 

 the eighth and twice as long as broad distally; the second-seventh segments are 

 carinate, the crest of the keel, which disappears in the middle of the seventh segment, 

 being straight and parallel to the axis of the segments. 



The third specimen from station 38 has 13 arms 105 mm. long. There are three 

 IIBr 4(3+4) series. The cirri are XV, 29-30, from 20 to 24 mm. long. 



One of the specimens collected by the Danish Expedition to the Kei Islands at 

 Amboina Bay has 18 arms 165 mm. long. Of the six IIBr series present four are 

 4(3+4) and two are 2. The two IIIBr 2 series are both internally developed. The 

 centrodorsal is discoidal with the dorsal pole flat, 4 mm. in diameter; the cirrus 

 sockets are arranged in two rows. The cirri are XXIII, 33, 30 mm. long. The cirrus 

 segments are subequal, ah 1 being about twice as broad as long. The 12 to 16 segments 

 preceding the penultimate have a low blunt median carination the crest of which 

 rises distally so that in lateral view the outer portion of the cirri appears roundedly 

 serrate. The opposing spine is prominent, much larger than the process on the 

 preceding segment, conical, arising from the entire dorsal surface of the penultimate 

 segment, and directed slightly forward. Occasionally it is much shorter with a 

 chisel-shaped edge, or forked. 



Another specimen from Amboina Bay has 23 arms. There are six IIBr 4(3+4) 

 series and seven IIIBr 2 series; of the latter six are internal and one is external, 

 developed by the side of an internal one. The centrodorsal is flat, discoidal, with 

 the dorsal pole 3 mm. in diameter; the cirri are in two irregularly alternating rows. 

 The cirri are XIX, 33-38, from 30 to 35 mm. long, slightly slenderer than in the 

 specimen described immediately above. 



A third specimen from Amboina Bay has 19 arms 120 mm. long. There are six 

 IIBr 4(3+4) series and three IIIBr 2 series, all the latter internally developed. The 

 cirri are XVII, 33, 30 mm. long. The color is dark purple, the outer two-thirds of 

 the arms banded purple and flesh color in bands about 3 mm. broad. The arm bases 

 are more or less mottled and banded with flesh color. The cirri are flesh color in 

 the proximal half or two-thirds, purple distally, sometimes also purple just at the 

 base. 



