MUSEUM OF COMPARATIVE ZOOLOGY. 125 
Length of arm about 12 mm. Width of arm close to disk, without spines, 
1.2mm. Seven small, short, rounded mouth-papillæ to each mouth-angle, the 
inner one longer and more prominent, Three squarish teeth, the upper one 
very small. Mouth-shields broader than long, inner angle broad and rounded, 
lateral corners rounded, and outer edge much curved ; length to breadth .7 :.6. 
Side mouth-shields large, somewhat swollen, square, and wide without; taper- 
ing slightly inward, where they just meet, First under arm-plate rounded and 
conspicuous ; the plates “beyond are short pentagonal, with an angle inward, 
Side arm-plates thick and somewhat flaring outward, meeting broadly below 
and also above beyond the first, which is broader than long, four- sided, with 
slight re-entering curves on the lateral sides and outer corners rounded ; beyond, 
the plates are pentagonal, with an obtuse angle inward, and lateral and outer 
sides straight. Disk thin and sunken, and contracted in the interbrachial 
spaces, covered with small overlapping plates; in centre are six rudely 
angular primaries, separated in the interbrachial spaces by several minute 
rounded scales, Radial shields large, longer than broad, swollen, raised above 
the surrounding scales, having a long angle inward and outer angles rounded ; 
separated their whole length by an inner and outer wedge, each composed of 
two small quadrangular plates ; length to breadth 1.5 :.8 : each shield touches 
that of the neighboring pair by its interbrachial edge, and is separated without 
by a marginal wedge-like scale. Lower interbrachial space with a row of scales 
on the margin, the central one being larger with edges rounded, its inner edge 
touching the mouth-shield. Genital scales short and thick, composed of two 
or three angular pieces. Five short, blunt, tapering arm-spines, about two 
thirds as long as an arm-joint, extending along the entire edge of the side arm- 
plate. One pointed tentacle-scale, so minute as to be seen with difficulty. 
Color in alcohol, pale brown. 
Station 192, 129 fathoms, 1 specimen. 
OPHIOZONA ۰ 
Ophiozona stellata sp. nov. 
Plate VI. Figs. 1477, 148. 
Special Marks. — Two short arm-spines placed low on the plate, the lower 
one twice as long as the upper. Arm somewhat flattened, side arm-plates not 
swollen, Radial shields small, irregular, widely separated. 
Description of an Individual (Station 168) — Diameter of disk 9 mm. 
Length of arm about 35 mm. Width of arm close to disk, without spines, 
1.8 mm. Four squarish close-set mouth-papillo on each side, and two longer 
and more pointed at angle of jaw. Four short stout teeth, the lowest thickened 
and rounded. Mouth-shields three-sided, with a long angle within, and outer 
edge much curved ; length to breadth 1.8: 1.8. Side mouth-shields short and 
thick, wide without; tapering to a point within, where they just meet. First 
under arm-plate very small, transverse oval in form; second plate wider 
