158 BULLETIN OF THE 
through which may be distinguished the upper side of the arm-bones. Disk 
flat and thin, covered with a thick, slightly wrinkled skin, which conceals the 
radial shields and the fine scaling, though the latter may be distinguished in 
the lower interbrachial spaces. Genital scales quite hidden. Genital opening 
extending from the mouth-shield to the margin of the disk. Three cylindrical, 
stout, nearly equal, pointed arm-spines, about as long as an arm-joint. One 
small rounded tentacle-scale on inner side of the tentacle-pore. Color in alco- 
hol, gray. 
I admit this species to Ophioscolex with some hesitation. The mouth-papillo 
are different in shape and arrangement; but the absence of upper arm-plates 
and the characteristic covering of smooth skin suggest its position. 
Station 24, off St. Thomas, 390 fathoms, 1 specimen. 
OPHIOLEBES * gen. nov. 
Disk and arms stout, and covered by a thick skin, which bears grains or 
stumps, and hides more or less the underlying plates. Arm-spines short, 
blunt, thorny, covered by thick skin, and arranged on the sides of the side arm- 
plates, which project but slightly. Long stout mouth-papille, and teeth ; no 
tooth-papille. Jaw-covers large and wide, making a circle by their connecting 
ends. Arm-plates rather small, but normal, nearly as in Ophiacantha. Two 
genital openings in each interbrachial space. 
Ophiolebes includes Ljungman's Ophiactis clavigera, besides the two species 
here described. 
Ophiolebes scorteus sp. nov. 
Plate VII. Figs. 196, 197. 
Special Marks. — Four short blunt arm-spines covered with thick skin, the 
upper one longest. Five feeble mouth-papille to each angle. Radial shields 
like ridges and set with grains. 
Description of an Individual (Station 145).— Diameter of disk 7.5 mm. 
Length of arm about 23 mm. Width of arm close to disk, without spines, 
1.5 mm. There may be seen on each angle the outlines of five small mouth- 
papilla, two widely separated on the sides and one longer and more slender at 
the apex, all covered by a thick skin, which, when removed, shows them as 
long, cylindrical, and stout. The mouth-shields, whose outlines may be vaguely 
seen, are small triangular, with an angle inward and outer edge curved. Side 
mouth-shields hidden by skin, which, when removed, shows them long and 
narrow, meeting within, and nearly or quite joining without, between first and 
second arm-plates, so as to form a continuous line about the mouth. First 
under arm-plate diamond-shape ; the rest are pentagonal, with an angle inward 
* dps, snake ; Ars, basin. 
+ The jaw-cover is the internal plate which roofs over the open angle above each 
pair of mouth-frames in the interbrachial space. 
