MUSEUM OF COMPARATIVE ZOOLOGY, 113 
Ophiomusium Lymani Wrv. Tuow. 
Ophiomusium Lymani, Depths of the Sea, p. 172, Figs. 32, 83. 1873. 
The specimens from the following widely separated stations showed certain 
minor differences, For example, those from Station 235 had more arm-spines 
and rather more numerous lower disk-plates, and the tentacle-scales were en- 
tire, instead of divided. I have deemed it best to keep the varieties together 
for the present. 
Station 45, 1245 fathoms, 1 specimen. Station 50, 1250 fathoms, 12 spec" 
mens, Station 76, 900 fathoms, 1 specimen. Off Tristan d’Acunha, 1100 
fathoms, 7 specimens, Station 169, 700 fathoms, 1 specimen. Station 191, 
800 fathoms, 4 specimens. Station 235, 565 fathoms, 5 specimens. Station 
296, 1825 fathoms, (only arms.) 
Ophiomusium laqueatum sp. nov. 
Plate I. Figs. 14-16. 
Special Marks. — Upper disk covered by large swollen radial shields, with 
minute imbricated scaling in centre, arms wide and thick, with side arm-plates 
much swollen and rounded. Upper arm-plates broad, diamond-shape. 
Description of an Individual (Station 192). — Diameter of disk 14 mm. 
Width of arm 3.5 mm. Mouth-papilla six or seven on each side, and one, dia- 
mond-shaped, at angle of jaw. Mouth-shields ovoid, slightly pointed within ; 
length to breadth 2:1.3. Side mouth-shields long, narrow, having curved 
sides, wider without than within, where they nearly or quite meet ; length 
2.3 mm, Genital scales very long and narrow, extending from mouth-shield 
to margin of disk, and bearing on their free edge an irregular row of elose-set 
oblong papille. Under arm-plates triangular, with an angle inward ; in the 
first two plates the angle is blunt, becoming more acute in those beyond ; 
outer edge somewhat curved. "lentacle-seales only on the first three plates ; 
they are minute, circular, two in number, set close together and situated very 
near the inner angle. Side arm-plates thick, swollen, barely meeting above 
and below at the inner angle of the upper and under arm-plates. Upper arm- 
plates near base of arm quadrangular, wider than long ; length to breadth 
1.3: 2; towards end of arm they are three-sided. Disk covered in centre 
with fine delicate scales, among which appear six larger rounded primary 
plates, which are widely separated, one in the centre, and one in each brachial 
space.. Radial shields oval, swollen, a little wider without than within, sepa- 
rated from each other their entire length by two or three long oval scales mingled 
with finer. Interbrachial spaces on upper surface occupied by two or three 
rounded scales, bordered by smaller, and of which the largest is on the margin 
of disk. Under interbrachial space covered by about a dozen. thick, rounded, 
swollen scales, almost concealing the genital scale ; the three largest stand on 
or near the margin. Four minute peg-shaped arm-spines ; three standing to- 
gether, low on the edge of the plate; the fourth placed much above them. 
Color in alcohol, white. 
Station 192, 129 fathoms, 1 specimen. 
