74 BULLETIN OF THE 
Width of arm close to disk, without spines, 1.7 mm. Six square, close-set 
mouth-papillee on each side, and one large diamond-shaped at apex of jaw. 
Mouth-shield much broader than Jong, with outer edge much rounded and 
an obtuse angle inward ; length to breadth 1.7: 2. Side mouth-shields long 
and narrow, just meeting within and with a swelling at the outer end. 
First under arm-plate triangular, transverse oval, or wide rounded hexag- 
onal; second plate pentagonal, with inner angle truncated, outer edge 
rounded and wider than inner one, lateral sides re-enteringly curved; be- 
yond this they are rounded triangular, with a broad curve without, and a 
peak inward. Side arm-plates wide, flat, even; meeting broadly below, beyond 
third plate separated above by the upper arm-plates, which are four-sided, with 
inner side shorter than outer, which is curved. Disk flat and thin, covered 
with fine, closely overlapping scales ; there are six large round primary plates, 
one in the centre and one to each brachial space, widely separated by the disk- 
scales ; on the surface of the disk are a few scattered, very minute spines, Ra- 
dial shields irregular rhomboidal, broad without and with a blunt angle 
inward, separated their entire length by a wedge of larger and smaller disk- 
scales ; length to breadth 2:1. Interbrachial surface on the under side covered 
with the same fine overlapping scales as above. Genital scales small, narrow 
within, widening a little without as they appear above the disk. Along their 
free edge, which extends from outer edge of mouth-shield to margin of disk, 
there is a close row of minute, squarish, tooth-like papilla, which become short 
and rounded on the arm-comb. ‘Three small pointed arm-spines, situated low 
on the edge of the side arm-plate close to tentacle-scales. On the pores of the 
mouth-tentacles five large rounded scales similar to mouth-papillo, on either 
side ; on the second set six on the interbrachial side and four on the brachial ; 
immediately beyond the disk there are only one or two on the inner and none 
on the outer side, Color in alcohol, white. 
Station 143, 1900 fathoms, 1 specimen. Station 164, (young of this species 1) 
410 fathoms, 6 specimens. 
Ophioglypha orbiculata sp. nov. 
Plate IV. Figs. 103 - 105. 
Special Marks. — Three very short, small, sharp arm-spines, low down. 
Mouth-shield as broad as long. Radial shields short, rounded, and separated 
by the fine scaling of the disk, Papille of arm-comb close-set, flat, and with 
rounded ends. 
Description of an Individual (Station 237). — Diameter of disk 15.5 mm. 
Width of arm close to disk 2.7 mm. Six or seven mouth-papille on each side, 
small, irregular, and tooth-like, with three longer and more pointed at apex of 
jaw. Mouth-shield broader than long, five-sided, having a broad angle within, 
with outer lateral corners rounded ; length to breadth 2.5 : 2.3. Side mouth- 
shields, following inner angle of mouth-shield, narrow, pointed without, and 
