MUSEUM OF COMPARATIVE ZOÜLOGY. Low 
long, broader without than within, separated by transverse depressions ; outer 
edge much thickened and curled downwards. Near end of arm they are wide 
pentagonal, with an angle inward and the outer edge scarcely thickened. Side 
arm-plates slightly projecting near base of arm ; meeting narrowly below, and 
scarcely or not at all above. Upper arm-plates wider than long, irregular 
in shape, with a curved outer side and an obtuse or irregular angle inward ; 
length to breadth about 1.5 : 3.5. Disk (in alcohol thick. rising well above 
the arms, and with a deep constriction and furrow in each interbrachial space. 
Along the outer portion of the interbrachial edge of each radial shield lie three 
or four plates, broader than long, and running diagonally outward ; the rest 
of the disk is occupied by coarse, irregular, overlapping scales, beset with short, 
stout, blunt, smooth, conical spines, which form an irregular line over the base 
of each arm. Radial shields sunken, much longer than broad, narrowest within, 
rounded and swollen without; length to breadth 5 : 2 ; separated by one or 
more narrow scales, Five stout, cylindrical, rather short arm-spines, tapering 
to a blunt point, with thorns on all sides; lengths to that of an arm-joint 3.7, 
4, 3.7, 3, 2.5: 2. Two thirds out on the arm, the second spine is much longer 
and attains a length of 8 mm. ‘'Tentacle-scales very stout, and thickened at the 
base ; pointed at the tip. On each of the first pair of pores there usually are 
three, on the rest only one. ‘Towards tip of arm the scale becomes spiniform. 
Color in alcohol, pale brown. 
Station 205, 1050 fathoms. 
Smaller specimens (Station 214, Pl. IX. Figs. 233-35) presented considerable 
variations : with a disk of 10 mm. the arm was 60 mm. long ; there were only 
seven mouth-papilloe to each angle; the disk-spines were thorny, the upper 
arm-plates narrow ; the outer edge of the under arm-plates was somewhat 
swollen, but not curled down ; the first tentacle-pore had only one or two 
scales; there were six comparatively long arm-spines, whose lengths to that 
of an arm-joint were 5.2, 3, 2.8, 1.8, 1.8, 1.5 : 1.8. Other specimens (Sta- 
tion 170), with disks from 12 mm. to 9 mm. in diameter, had &mooth disk- 
spines, like 205, and six arm-spines, and upper and under arm-plates, like 
214. The number of mouth-papille to each angle varied from seven to ten, 
without reference to size of specimen. 
Station 170, 630 fathoms, 6 specimens. Station 205, 1050 fathoms, 1 speci- 
men, Station 214, 500 fathoms, 3 specimens. 
Ophiomitra Sarsii sp. nov. 
Plate VIII. Figs. 216, ۰ 
Special Marks, — Eight stout cylindrical arm-spines. — "lentacle-seales flat, 
tapering, jagged, Sealing of disk finer than in O. plicata. 
Description of an Individual (Station 146). — Diameter of disk 15 mm. Length 
of arm about 100 mm. Width of arm without spines 4.5 mm. Seven or eight 
thick pointed mouth-papille to each angle. Seven teeth of similar form, but 
