fi: 



THE OPHlURIDiE 



149 



30. AmpMura brevipes n. sp. 



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I 



riate XI. Figs. 4-6. 



Diameter of disk, 8 mm. 5 width of arms close to disk, 1.3 mm.; length 

 of arms not known with certainty, but evidently they are only about 4 to 5 

 times the diameter of the disk. One conical, rather short mouth papilla 

 on each side; the infradental papillse have the abradial corner produced. 

 Mouth shield equally wide and long, almost rhomboidal, with a right angle 

 within, side corners rounded and oiiter angle truncated ; inner sides straight, 

 outer sides slightly concave. Side mouth shields short, very wide, meeting 

 broadly within ; their outer end is considerably broader than the inner end. 



First ventral plate rather large, more than half the length of the second; 

 those beyond the first equally long and wide, rather broadly in contact in 

 the inner part of the arm ; farther out it is only the tip of the inner angle 

 which reaches the foregoing plate. Outer edge curved, outer corners much 

 rounded ; inner and outer laterals slightly re-enteringly curved. Side arm- 

 plates with rather prominent S23ine-ridge ; the naked space sej)arating the 

 side plates of each two adjoining joints also seen from the dorsal side. Dor- 

 sal plates about twice as broad as long, just separated by the side arm-plates; 

 they are transversely oval, their inner sides a little sigmoidly curved. 



Dorsal side of the disk covered with delicate, "bverlapping scales, among 

 which the primary plates are not distinct, except the central plate. Radial 

 shields scarcely half as long as the radius of the disk, separated in their 

 whole length by one or two narrow, elongated scales. They are almost 

 semilunar, the outer end truncated. Along their outer edge is a single row 

 of small scales; almost no incisure in the disk. The under side of the disk 

 is partly naked, though with some few spread scales; only along the margin 

 there is a rather broad band of scales, like those on the dorsal side. Inner 

 end of the genital scale just visible. Edge of the disk rounded, the margin a 

 little re-enteringly curved. 



Three equal tapering arm-spines, as long as a joint. No tentacle scales. 



Color in alcohol : gray. 



One specimen from Station 3399, 1740 f. 



8 



**V ^JX^_. 



