222 BULLETIN OF THE 
the upper one partly overlaps the base of the lowest arm-spine. Color in alco- 
hol, pale yellow. 
Sigsbee, off Havana, 243 — 450 fathoms, 1 specimen. 
This species differs from O. F'orbesi? in the greater number and length of the 
arm-spines, and in having two tentacle-scales. 
Ophiochosta (?) mixta sp. nov. 
Plate II. Figs. 40-42. 
Special Marks. — Disk closely beset with grains, among which, on the upper 
surface, appear numerous short spikes. Seven arm-spines; the two upper 
ones longest, and as long as three arm-joints. 
Description of an Individual. — Diameter of disk 8 mm. Length of arm 
about 60 mm. Width of arm without spines 2.3 mm. To each mouth-angle 
there are fourteen papille ; the three outer being stoutest and flattened, the rest 
spine-like, with the smallest at the apex. Six short, wide, flat teeth. Mouth- 
shields large, triangular, with a blunt angle within, and outer edge curved ; 
length to breadth 1.3:1.3, The space between the mouth-shield and the 
mouth-papille is covered with minute grains, similar to those of the disk. 
Under arm-plates broader than long, much broader without than within ; 
outer side curved ; lateral sides re-enteringly curved. The first plate is small, 
of a transverse oval shape, with lateral corners pointed. Side arm-plates 
narrow, slightly projecting at their outer edge, meeting below midway on the 
arm, but separated above by the somewhat swollen upper arm-plates, which 
are rudely hexagonal, with their inner lateral sides longest Disk flat, pen- 
tagonal, densely covered with small, rounded grains, interspersed above with 
short spikes of varying length. On removing this granulation, the radial 
shields are seen to be longer than wide, but quite small, and separated their 
entire length. Seven long, tapering arm- -spines, the five lower being equal, 
and about as long as two ‘arm-joints, while the two upper are longer. Two 
large, angular tentacle-scales, whereof the upper one overlaps the base of the 
lowest arm-spine, Genital opening long and narrow, the scale being quite 
covered by granulation. Color in alcohol, disk pale olive-green, arms lighter. 
Sigsbee, off Havana, 242 fathoms, 4 POA! Sigsbee, off Havana, 160 
fathoms, 5 specimens, Sigsbee, off Havana, 175 fathoms, 5 specimens. 
In the long and more movable arm-spines (not standing on the extreme 
outer edge of the side arm-plate, nor clinging to the arm) and the diflerently 
shaped ander arm-plates, this species varies from Ophiochota as defined by 
Lütken (Addit. ad Hist. Oph. III. pp. 38, 89, 98, 105); nevertheless, it may 
perhaps be placed in that genus without impropriety. 
Ophiothyreus Goésii Lsv. 
Ophiothyreus Goësii, Of. Kong. Akad. Dr. Gots Oph. p. 619. 1871. 
Sigsbee, off Havana, 80 fathoms, 1 specimen. Sigsbee, off Havana, 127 fath- 
oms, 8 specimens. Sigsbee, off Havana, 175 fathoms, 2 specimens. Sigsbee, 
off Havana, 242 fathoms, 2 specimens. 
