NOKTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 277 



which extends out well beyond middle of spine, thus forming a sort 

 of "fin" on each side of arm; each lower spine is connected with 

 upper spine of same joint by a narrow membrane; these little vertical 

 "fins" are much less conspicuous, however, than the horizontal one 

 above them. Tentacle pores very large but tentacle scales none. 

 Color (dried from alcohol) , disk brown, spotted with white calcareous 

 granules; arms nearly white. 



Localities. Albatross station 4934, off Kagoshima Gulf, lat. 30 

 58' 30" N.; long. 130 32' E., 103 to 152 fathoms, rocky, bottom 

 temperature 60.6 to 56, 1 specimen; station 4936, off Kagoshima 

 Gulf, lat. 30 54' 40" N.; long. 130 37' 30" E., 103 fathoms, stones, 

 bottom temperature 60.6, 1 specimen; station 5094, Uraga Strait, 

 lat. 35 4' 42" N.; long. 139 38' 20" E., 88 fathoms, black sand, 

 broken shells, bottom temperature 54.8, 1 specimen. 



Type. Cut. No. 25671, U.S.N.M., from station 4934. 



The disk of the type is badly damaged, while the arms are fairly 

 well preserved. The specimen from station 4936 has a pretty good 

 disk but the arms are in poor condition and fail to. show the webs. 

 The specimen from station 5094 is so badly damaged it is not certain 

 that it belongs to this species. Judging from the arm structure of 

 the type, it seems as though this species ought to be able to swim, 

 and it is quite possible that such is its regular mode of locomotion. 

 Observations on its habits would be most interesting. 



OPHIOHYMEN, new genus. 



Disk and arms covered with naked skin. Radial shields and upper 

 arm plates wanting. Mouth parts as in Ophiomyxa. Arm spines 

 connected vertically by membranes and upper ones also connected 

 horizontally. 



Type-species. Ophiohymen gymnodiscus. 



This genus is a curious connecting link between Ophiosyzygus, 

 which it resembles in disk and arm structure, and Ophiomyxa. which 

 it is like in its mouth parts. 



OPHIOHYMEN GYMNODISCUS, new species.^ 



Disk 8 mm. in diameter; arms about 35 mm. long. Disk and arms 

 covered with a thick skin, extending also over interbrachial spaces 

 below, lower surface of arms and jaws and even to tips of oral papillae. 

 No radial shields, upper arm plates or tentacle scales. Upper ends of 

 genital plates scarcely visible at base of arms, from above, but genital 

 scales extending into interbrachial spaces, plainly visible from below 



v #</>.'o and i/ir}v, signifying membrane in reference to membrane connecting arm 

 spines. 



b Fo^of, signifying naked, and dlaKof, signifying disk, in reference to the perfectly 

 bare disk. 



