BULLETIN OF THE 
OPHIOSCIASMA * gen. nov. 
Disk covered with thick soft skin finely granulated. Arms very slender, 
with lower and side plates imperfectly calcified, and no upper plates. Mouth- 
papille and teeth represented by a bunch of spines, or thorns, at apex of jaw. 
Arm-spines arranged on sides of side arm-plates. Two large genital openings 
in each interbrachial space. 
A singular genus, which, by its disk covered with soft skin and lack of up- 
per arm-plates, is allied to Ophioscolex, but differs by its granulation, and its 
extremely slender, knotted arms. 
Ophiosciasma attenuatum sp. nov. 
Plate VII. Figs. 193-195. 
Special Marks, — Disk beset with a very fine but not continuous granula- 
tion. Arms very slender, knotted, and at centre of the joints diaphanous. 
Three small nearly equal arm-spines. 
Description of an Individual (Station 122).— Diameter of disk 6 mm. 
Length of arm 45 mm. Width of arm without spines .6 mm. Mouth-papille, 
teeth, and tooth-papille combined in form of a clump of seven or eight sharp 
thorns or spines, standing round the apex made by the juncture of the long 
narrow mouth-frames. Mouth-shields of a transverse diamond-shape, very 
small, sometimes scarcely visible, more or less hidden by thick skin. Side 
mouth-shields very narrow and slender, meeting within. Under arm-plates 
very thin, and in their central part transparent, so that their outlines are 
vague ; longer than broad, with outer side slightly curved and lateral sides 
re-enteringly curved ; length to breadth .5:.4. Side arm-plates reduced to 
a strip, like a double cord, running along the side of the joint. No upper 
arm-plates. The arm-bones are but slightly calcified, except at their thick- 
ened ends, so that their more slender central shaft is translucent. The arm 
thus presents a beaded appearance, with swellings where the ends of the 
arm-bones form joints and support the arm-spines. Disk covered with a 
thick skin, which above is beset with fine grains, and which partially obscures 
the mouth-papille and the arm-spines. No radial shields or disk-scales visi- 
ble. Three small, blunt, nearly equal arm-spines, not so long as an arm-joint, 
seen to be microscopically rough when free of skin, and standing nearly at 
right angles to arm. Tentacles large, simple, and fleshy ; no tentacle-scales. 
Color in alcohol, very pale yellow. 
Station 122, 350 fathoms, 1 specimen. 
* Uds, snake ; oxidopa, shadow. 
