A MONOGRAPH OF THE EXISTING CRINOIDS 153 



are twice as long as broad, and are somewhat angular and spiny. The segments of 

 the other pinnules are smooth. The distal pinnules are from 4.5 to 6 mm. long with 

 14-17 segments. The disk has been thrown off. The color is yellow with black-red 

 spots. 



One of the specimens from eastern Asia has 12 arms 45 mm. long. The other 

 also has 12 arms; the processes on the distal ends of the segments of P 2 and PS are very 

 strongly marked, suggesting certain forms of Oiigometra serripinna. 



The specimen without locality in the Copenhagen Museum is small with 12 arms. 



The specimen from Okinawashima is small with 20 arms. 



In one of the specimens from Bock's station 53, as described by GisleX the cirri 

 are XIV, 9, 2 mm. long. The third and fourth segments are twice as long as broad. 

 There are no dorsal spines, but the ends of the segments are somewhat swollen. The 

 height of the opposing spine is equal to half the width of the penultimate segment. 

 The terminal claw is a little longer than the penultimate segment. The radials are 

 twice as broad as long. The IBr : are as long as broad. The IBr 2 (axillaries) are half 

 again as broad as long, and form a slight synarthrial tubercle with the IBiv The 

 10 arms are 13 mm. long. PI is 1.5 mm. long with 10+ segments. P 3 to P 6 are 

 wanting. The disk is 1.3 mm. in diameter and is not incised. Gisle"n says that this 

 is a young specimen, like the following. 



In the other specimen from Bock's station 53 the cirri are XVI, 9-11, and are 

 arranged in a single or partly double row. The 13 arms are 15+ mm. long. The 

 IIBr series are 2. The brachiala are very much hour-glass shaped. The inter- 

 syzygial interval is 4 or 5 muscular articulations. P! is 3.5 mm. long with 14 segments. 

 P 2 is 2.5 mm. long with 13 segments. The disk is incised, and is dark red. 



In one of the specimens from Bock's station 59, as described by Gislen, the cen- 

 trodorsal is discoidal, 4.5 mm. in diameter and 1.8 mm. high, with the bare dorsal 

 pole 3 mm. hi diameter. The cirri are XXIX, 31-35, from 19 to 21 mm. long. The 

 third and fourth segments are about as long as broad, the fifth-ninth are slightly longer 

 than broad, and those succeeding are shorter again. The tenth-twelfth segments 

 have a dorsal transverse ridge, the thirteenth-sixteenth have a 3-pointed promi- 

 nence, and the slxteenth-twenty-fourth have at first a double and later a single dorsal 

 spine. The two parts of the double prominences are sometimes not distinctly sepa- 

 rated. The dorsal spines are very small but are well defined in side view; they are 

 median hi position, and in height equal one-fifth the width of the segments. The 

 opposing spine is considerably larger than the spines on the segments preceding, in 

 height equaling from one-half to two-thirds the width of the penultimate segment. 

 The terminal claw is pointed, curved, and about as long as the penultimate segment. 

 The radials project beyond the margin of the centrodorsal. The IBri are six times 

 as broad as long and are laterally free. The IBr 2 (axillaries) are twice as broad as 

 long, their lateral sides making a slight angle with those of the IBiy. There is a well- 

 developed synarthrial tubercle on the articulation between the ossicles of the IBr 

 series. The IIBr and IIIBr series are 2, the latter externally developed. The arms 

 are 26 in number (probably originally 28), and are broken. They are smooth, and 

 the brachials beyond the ninth are oblique. Syzygies occur between brachials 

 3+4, 18 + 19, and distally at an interval of (6-) 9 muscular articulations. PI is 

 6 mm. long with 17 segments; on the second brachial from the inner arm of a IIBr 



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