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114 



THE OPHIURIDiE. 



has a shape different from that of the rest. Not so many tentacle scales as 

 in larger specimens ; five arm-spines. No distinct secondary arm-comb. 



Color in alcohol : gray, with a faintly bluish tint on the skin ; the radial 

 shields appear as white lines. In dried specimens the naked skin is almost 



black. 



Stations 3392, 1270 £3 3400, 1322 f. ; 3413, 1360 f. 



9. GymnopMura ccerulescens n. sp 



Plate VII. Figs. 4-6. 



Diameter of disk, 21 mm. 5 width of arm close to disk (without spines), 

 5 mm.: len^^th of arms unknown, but evidently as in G. rn,oUis, Six (5-7) 

 short, not very close set, more or less conical mouth papilla;, one longer at 

 the apex. The outermost papilla does not separate the first tentacle pore 

 from the mouth space. Mouth shield a little longer than broad, with a very 

 obtuse angle (or rounded) within and outer edge rounded; the lateral sides 

 restricted at the inner end, then straight until the outer edge; the inner 

 part of the mouth shield is thus broader than the outer part; sometimes it 

 is quite irregular in outHne. Side mouth shields rather short, equally broad 

 without and within, sometimes meeting within, sometimes more or less 



widely separated by a naked space. 



First ventral plate a little smaller than the following, with the sides 

 rounded, inner edge straight, outer edge curved inward ; in other specimens 

 it is more hexagonal, with outer edge straight; sometimes it is divided by a 

 median line. The following ventral plates are about twice as broad as 

 long; they are in mutual contact until the c. 8th joint, the piece in contact 

 becoming gradually narrower. The outer edge is almost straight, only with 

 a Httle rounded peak in the median line ; the inner edge straight on the inner 

 plates; the lateral sides shghtly sigmoidly curved, making an angle of about 

 45'' with the longitudinal axis of the arm. The outer edge is much broader 

 than the inner edge. From the c. 9th joint there is an angle within, but 

 that gradually disappears farther out, and the whole inner side of the 

 ventral plate is then rounded or almost straight, the plate being thus very 

 short but broad. Side arm-plates with outer edge a little prominent; they 

 seem to be widely separated above to the end of the arm. The dorsal 

 plates more than twice as broad as long, becoming gradually longer and 

 narrower farther out on the arm ; they have a feeble keel. Outer and inner 



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