120 BULLETIN OF THE 
without than within, four-sided, having lateral sides re-enteringly curved and 
a peak without ; those beyond are similar, but nearly pentagonal. Side arm- 
plates broad and thick, meeting below beyond the fourth under arm-plate and 
above beyond the second upper arm-plate, which is fan-shaped, with an angle 
inward, Disk flat and rather thin, covered with stout, rounded, microscopically 
tuberculous plates, whereof a large primary occupies the centre, with five others 
about it, separated in the interbrachial space by a radiating row of two or more 
scales ; outside these, again, is a row of ten semicircular plates with small scales 
between ; near each interbrachial margin are two plates side by side ; on the 
lower interbrachial space are three transverse rows of irregularly shaped plates. 
Genital scales composed of three irregular pieces placed end to end. Genital 
openings extending from outer edge of mouth-shield to margin. Two short, 
stout, blunt, tapering arm-spines placed low on the side arm-plate, the lower 
one twice as long as the upper and about half as long as an arm-joint. One 
large rounded tentacle-scale on the inner side of the tentacle-pore. Color in 
alcohol, pale gray. 
A young with a disk of 2.8 mm. had arms 5 mm. long. The disk was 
more arched, and its plates, of course fewer, were microscopically tuberculous. 
The side mouth-shields were very large and swollen, and the mouth-shields 
small. The first under arm-plate larger than in the adult, and the rest much 
smaller proportionately. 
Station 168, 1100 fathoms, 12 -+ specimens. Station 169, 700 fathoms, 
12 + specimens. 
Ophiozona insularia sp. nov. 
Plate VI. Figs. 149-151. 
Special Marks. — Four short, nearly equal arm-spines. Arm high. Side 
arm-plates swollen, and strongly flaring outward. Radial shields large, 
rounded triangular, widely separated. 
Description of an Individual (Station 173). — Diameter of disk 6 mm. 
Length of arm about 18 mm, Width of arm close to disk, without spines, 
1.6mm. Five short, squarish, elose-set mouth-papillx on each side, one large 
spearhead-shaped at apex of angle. Mouth-shield longer than broad, with a 
very deep curve Without, and an angle within ; length to breadth, 1 : .8. Side 
mouth-shields short and thiek ; rather wider without than within, where they 
meet, First under arm-plate very small, transverse oval in shape ; second, 
third, and fourth plates large and five-sided, with inner angle truncated, small 
re-entering curves on the lateral sides, and outer edge slightly curved ; beyond, 
they approach a fan-shape, with an angle inward. Side arm-plates broad, 
swollen, and flaring outward, just meeting below beyond the fifth under arm- 
plate, and above beyond the fifth or sixth arm-plate, which is fan-shaped, with 
an angle inward. Disk rounded pentagonal and flat, with a large central plate, 
and five others round it, separated from each other by a wedge-scale ; inter- 
brachial spaces filled by four angular plates, a large one within, oufside this 
