118 BULLETIN OF THE 
which form above the base of the arm two irregular transverse rows, three or 
four in each row. Three small peg-like arm-spines about one third as long as 
a joint. Color in alcohol, pale gray. 
Station 171, 600 fathoms, 1 specimen. 
Ophiomusium granosum sp. nov. 
Plate I. Figs. 12, 13. 
Special Marks. — Most of the lower interbrachial space outside the mouth- 
shield is occupied by broad genital scales and a great central plate. No 
under arm-plates beyond the third. Five short, sharp, well-marked arm- 
spines. The great lower interbrachial plate is separated by a square one 
from the mouth-shield. Margin of disk set with small points. 
Description of an Individual (Station 237). — Diameter of disk 10 mm. 
Width of arm, without spines, close to disk 2 mm. Mouth-papille very 
closely soldered together, forming a ridge. Mouth-shields triangular, with 
an acute angle within, and the outer edge curved. They bear minute spines. 
Side mouth-shields long and narrow ; meeting within, where they are nar- 
rowest. Genital scales large, angular, longer than wide. First under arm-plate 
semicircular ; second and third triangular, with an acute angle inward. Side 
arm-plates minutely tuberculous, meeting broadly above and below, and nearly 
covering the entire arm beyond the disk. Upper arm-plates minute, triangular, 
with acute angle inward. There are no tentacle-scales, Disk covered with 
closely soldered plates, having decided furrows between them ز‎ the microscopic 
tuberculation usual in the genus is very coarse, and rises near edge of disk into 
small points. The margin is occupied by a large, angular, swollen plate, cov- 
ered with points, which connects the radial shields with the genital scales, and 
is united to the mouth-shield by a smaller rectangular plate, also carrying 
points. Radial shields pear-seed shape, diverging inward, where they are 
separated by a triangular plate. In centre of upper surface of disk is a large 
pentagonal primary plate, surrounded by five others, quadrangular, and con- 
nected with the radial shields by five rudely triangular pieces ; in each inter- 
brachial space above are two quadrangular plates, besides that of the margin. 
Arm-spines five in number, occupying the whole edge of the side arm-plates ; 
they are short, rounded, and delicately tapering. Color in alcohol, gray. 
Station 237, 875 fathoms, 4 specimens. 
Ophiomusium pulchellum Wrv. ۰ 
Voyage of the “Challenger.” The Atlantic, Vol. II. p. 67, Figs. 18, 19. 
Plate V. Figs. 144, 145. 
Special Marks. — Primary plates bearing a large central tubercle ; second 
pair of side arm-plates wide, and flaring below ; lower interbrachial space 
occupied almost wholly by large genital scales, and a marginal plate like a 
tubercle. 
