128 BULLETIN OF THE 
blunt-pointed arm-spines, the upper one longer, and two thirds as long as an 
arm-joint. One large round tentacle-scale on each pore. Color in alcohol, 
white. 
Station 23, 450 fathoms, 1 specimen. 
Ophiozona depressa, sp. nov. 
Plate VI. Figs. 155 - 157, 
Special Marks.—Two nearly equal short arm-spines. Arm low. Side 
arm-plates slightly flaring without. Radial shields large, oval, and widely 
separated, 
Description of an Individual (Station 214). — Diameter of disk 11 mm. 
Length of arm about 37 mm. Width of arm close to disk, without spines, 
1.8 mm. Four short, squarish, close-set mouth-papille on each side, the 
outer one very small, and a pair somewhat more pointed at apex of angle. 
Mouth-shields longer than. broad, with a sharp angle within, and outer side 
bounded by a deep curve; length to breadth 2:1.7. Side mouth-shields 
short, broad without, tapering inward, where they meet in a point. First un- 
der arm-plate very small, transverse pointed oval; next two plates long pen- 
tagonal, with a truncated angle within, deep re-entering curve on each inner 
lateral corner, and a curved outer edge ; beyond these the plates are short 
pentagonal, Side arm-plates low (the arm being flat), little swollen, slightly 
flaring outward, meeting below beyond the fifth under arm-plate, and above 
beyond the second upper plate, which is fan-shaped, with an angle within. 
Disk round and flat ; in the centre is a large pentagonal primary plate, round 
which are five others, smaller and more or less rounded, separated from each 
other by a triangular scale. These primary plates have a little central boss or 
tubercle ; in the interbrachial spaces is a radiating row of three large elongated 
plates, the outer and longest being marginal. Radial shields flat, longer than 
broad, oval, separated their entire length by two large plates; length to 
breadth 2.5 : 1.7 mm. Lower interbrachial space filled by irregular trans- 
verse rows of uneven plates, the outer row long and angular. Genital scales 
long, narrow, and. broken in several pieces. Genital opening not extending to 
margin of disk. "Two short, blunt, tapering arm-spines of equal length, and 
about half as long as an arm-joint. One large rounded tentacle-scale on the 
inner side of each tentacle-pore, Color in alcohol, white. 
Station 214, 500 fathoms, 3 specimens. 
Ophiozona nivea Lym. 
Ophiozona nivea, 111. Catal. Mus. Comp. Zool. VIII. No. 2, p. 9, Figs. 85, 86. 1875, 
Station 24, off St. Thomas, 390 fathoms, 1 specimen. 
