BULLETIN OF THE 
OPHIOCAMAX gen. nov. 
Ophiocamax vitrea sp. nov. 
Plate VIII. Figs. 218-221; Plate IX. Figs. 242-244 (young). 
Special Marks, — Mouth-papillae numerous, spine-like, arranged in a tuft. 
Tentacle-scales blunt spiniform, two or three to each pore. Disk covered 
above with rounded, equal, thin scales set thickly with minute thorns and 
crochets. 
Description of an Individual (Station 219). — Diameter of disk 17 mm. 
Width of arm without spines 4.4 mm. About thirty long, spiniform, equal 
papillee to each angle, set in two or three ranks; of which half a dozen 
are arranged under the teeth, and may be considered tooth-papille ; and 
three on either side are borne on a small plate or scale, at outer corner 
of mouth-slit, and cover the second mouth-tentacle. Seven broad flat 
teeth, with a rounded cutting edge. Mouth-shiclds small, broader than 
long, with an obtuse angle within and a truncated angle without, bearing 
a few short spines; length to breadth 1.5 : 2. Side mouth-shields exception- 
ally large and wide, meeting broadly within, having their inner sides gently 
curved. Under arm-plates with a wide, slightly curved, somewhat swollen 
outer edge, and a narrow projection within, where they join the next plates; 
on each lateral side a sharp re-entering curve, where the tentacle issues ; 
length to breadth 2 : 2.6. Side arm-plates near base of arm not meeting 
below and scarcely above ; forming broad, abrupt, but not very high ridges. 
Upper arm-plates slightly swollen, about as broad as long, with a gentle 
curve without and a deep curve within. The whole arm is sparsely set with 
minute points. Disk flat and even, closely set with fine short spines which are 
sharp and thorny or forked, Radial shields flat and regular, triangular, with 
an angle inward, bearing a few spines like those of the disk, and separated. 
by a row of the same; length to breadth 4: 2.5. Near base of arm nine 
slender, slightly flattened, glassy arm-spines, whereof the three lowest are very 
small. Unlike those of Ophiacantha, these spines are not hollow. Lengths to 
that of an arm-joint 3, 3, 3.6, 4, 3, 1.6, 1.2, .8,.6: 2. Three stout, club-shaped, 
spiniform tentacle-scales on the first pore, and usually two on those immediately 
beyond. Color in alcohol, straw. 
A younger specimen (Station 192, Pl. IX. Figs. 242 — 244), with a disk of 
12 mm., had the upper arm-plates longer ; the basal under arm-plates did not 
touch each other ; the sealing of the disk was distinctly marked ; there were 
three tentacle-seales on the basal pores ; the arm-spines were seven ; lengths 
to that of an arm-joint 2.2, 4.4, 3, 2.2, 2, 1.5, 1.2 : 1.5. 
Station 192, 129 fathoms, 1 specimen and young. Station 201, 102 fath- 
oms, 1 specimen. Station 204, 100 fathoms, 1 specimen, Station 219, 152 
fathoms, 2 specimens. 
