BULLETIN OF THE 
150 
thorny arm-spines ; lengths to that of an arm-joint 1.3, 1.3, 1, 1, .6, .4, .4 : .5. 
Beyond the basal joints there are but six spines, whereof the upper are shorter 
than those described above. One very small, narrow, pointed tentacle-scale, 
Color in alcohol, nearly white. 
Station 142, Agulhas Bank, 150 fathoms, 4 specimens. 
O. vicarius bears a general resemblance to this species, but is distinguished 
by narrower side mouth-shields and by long and numerous disk-spines. 
Ophiothamnus vicarius ۰ 
Ophiothamnus vicarius, Bull. Mus. Comp. Zool. I. No. 10, p. 342. 1869. 
Station 23, 450 fathoms, 8 specimens. 
OPHIOMITRA. 
TABLE OF SPECIES HEREIN DESCRIBED. 
Mouth-pa 
plicata. 
Sarsii. 
chelys. 
carduus, 
. dipsacos. 
Arm-spines five or six, 
0. 
j 
۳ 
J 
0. 
۳ 
pille inclined to strong spiniform. | 
Arm-spines stout. Outer edge of under arm- 
plates swollen, and in lar 
down, 
> specimens turned 
Five or six arm-spines, 
Eight spines, less stout than in O. plicata, 
and disk-seales finer. Tentacle-scales jagged or 
thorny. 
Radial shields widely separated, the large 
disk-plates running along their entire interbra- 
chial margin. Under arm-plates not swollen. 
Under arm-spine thickened, and beyond middle 
of arm bent. 
Outer edge of 
Tentacle-scales ۰ 
straight. 
Upper arm-plates long and slender. Marginal 
disk-plates large, and much swollen. Central 
disk-scales fine, and bearing minute thorny 
under arm-plates swollen 
Under arm-spines 
(stumps. 
the median interbrachial 4 
Radial shields depressed ; along 
their outer corners and along 
margin of disk are large, some- 
what swollen plates, wider than 
long ; 
space filled by smaller plates or 
3. Five to eight arm-spines. 
alcohol, each interbrachial 
space contracts, forming a de- 
pression or crease. 
sea 
In 
Ophiomitra plicata sp. nov. 
Plate VIII. Figs. 209-212; Plate IX. Figs. 233 - 235. 
Disk-spines stout and conical. 
Special Marks. — Mouth-papille thick, spiniform. 
Outer edge of under arm-plates swollen and in large 
stout and cylindrical. 
specimens turned down. 
Description of an Individual (Station 205).— Diameter of disk 16mm. Length 
Mouth-papillto 
Teeth similar 
Mouth-shields small, as long as 
stout, spiniform, about equal, blunt. 
Width of arm without spines 5 mm. 
of arm about 132 mm. 
nine to each mouth-angle ; 
to mouth-papillee, but shorter and flatter. 
broad, with an irregular outline ; the outer margin more or less thiekened and 
Side mouth-shield broad, thick, 
Under arm-plates broader than 
2. 
and closely joined to the surrounding parts. 
curled downwards; length to breadth 2: 
