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THE OPHIURIDiE. 



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31. Amphiura gymnopora n. sp. 



Plate XI. Figs. 7 9. 



Diameter of disk, 6 mm. ; width of arm close to disk, without spines, 

 1 mm. ; length of arms about ten times the diameter of the disk. One 

 very short, rounded mouth papilla on each side ; the infradental ones simply 

 conical. Mouth shield a little longer than wide, with a rounded angle 

 within, outer part restricted, side corners rounded, inner sides feebly 



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curved. Side mouth shields mostly not meeting within; inner end very 

 narrow, outer end much wider. 



First ventral plate small, six-sided; those beyond equally long and broad 

 just in contact, all with an angle within, and outer edge doubly curved, with 

 a cut in the median line. Outer corners sharp, inner and outer laterals 

 re-enteringly curved; there is a distinct keel along the median line. Side 

 arm-plates with spine-ridge little prominent ; the naked space separating the 

 side plates of each two adjoining joints distinct also from the dorsal side. 

 Dorsal plates transversely oval, in mutual contact, twice as broad as long. 



Dorsal side of the disk covered with small but distinct overlapping scales, 

 among which the primary plates are not distinguishable, except the cen- 

 tral plate. Radial shields scarcely half as long as the radius of the disk ; 

 they are separated at theit inner end by several small scales, at their outer 

 end only by one elongated scale. Their adradial edge is straight, the abra- 

 dial cu.rved, especially towards the outer end, which is rather broad, almost 

 straightly cut; the inner end is somewhat rounded. The under side of the 

 disk covered by extremely small but distinct scales. The genital scales dis- 

 tinct in the whole length. Edge of the disk rounded, the margin re-enter- 

 ingly curved. 



Three tapering arm-spines, the median one inconsiderably longer than 

 the others, a little longer than an arm-joint. No tentacle scales. 

 Color in alcohol : dark gray. 

 Several specimens from Station 3355, 182 f. 







