7 g NATURAL HISTORY BULLETIN. 



Upper surface of the arms without visible dorsal plates, 

 covered with thin naked skin containing very minute gran- 

 ules, becoming more distinct distally. The outlines of the in- 

 ternal arm-plates can be seen. Near the tips of the arms 

 small scattered granules occur. 



Under side of disk and arms every where apparently naked, 

 except for a few granules around the genital slits and mouth- 

 angles, but the skin, when dry, is filled with minute rough 

 grains, visible only when much magnified. 



Mouth-papillge five or six in a regular row, small, conical 

 and granule-like; larger conical papilla? occur at the tip of the 

 jaw. A pair of minute, conical, oral tentacle-scales at the 

 outer corner of the mouth slits. 



Spines or tentacle-scales on the first joint one, minute and 

 sometimes lacking; on the second joint generally one or two, 

 long and slender; on succeeding joints two rather long, about 

 equal to breadth of arms, slender, tapered; the lower one is 

 longest and largest, cylindrical, blunt, or even a little en- 

 larged toward the end, and covered near the tip with rough 

 spinules; on those close to the end of the arms the terminal 

 spinules become almost claw-like. The upper spine is also 

 roughened in the same way, but less distinctly so. 



Color, in alcohol, light buff. 



Diameter of disk, 7 mm; length of arms, about 50 mm. 



Station 33, off Sand Key, 105 fathoms, one example; sta- 

 tion 37, off Key West, 125 fathoms, one example. 



Probably attached to gorgonians or hydroids. 



Ophiocreas lumbricus Lyman. 



Ophiocreas lumbricus Lyman, Bull. Mus. Comp. Zool., I, 10, p. 347, 

 1869; 111. Cat. Mus. Comp. Zool., VI, pi. I, figs. 19-21; Bull. Mus. 

 Comp. Zool., V, 9, p. 236; op. cit., X, p. 281; Lyman, Report Voy. 

 Challenger, Zool., Ophiuroidea, V, p. 284, 1882. Nutting, Narrative, 

 Bahama Exp., p. 171, pi., fig. 1. 



Station 4, off Havana, no fathoms, one example; stations 

 26, 28 and 48, off Key West, 60, 116 and 80 fathoms, four- 



