MUSEUM OF COMPARATIVE ZOOLOGY, 81 
they scarcely meet. First under arm-plate broad triangular, or broad rounded 
hexagonal, with outer edge much curved, and a very blunt angle inward ; 
second plate nearly square, with rounded corners ; the next two rudely semi- 
circular, with outer edge straight, or broad much rounded pentagonal, with an 
ill-marked angle inward ; the rest are transverse oval, with a peak inward, 
Side arm-plates wide, a little swollen, meeting below Wevod the disk, sepa- 
rated above by the upper arm-plates, which are much broader than long, 
with outer edge broken in three angles or curved, and the lateral sides forming 
an angle. Disk arched, but not thick, covered above and below with small, 
thin, closely soldered scales, the six primaries being small, circular, widely 
separated plates. Radial shields much longer than wide, with a sharp angle 
inward, separated by a wedge of disk-scales ; length to breadth 4.5 :2. 
Genital scales very narrow, covered by fine scaling, bearing on their free edge 
a close row of very fine, square papillæ, which increase a little in size as they 
appear above to form the arm-comb. Three tapering arm-spines, about half 
as long as a joint ; the upper one the longest. Larger specimens have five or 
more spines, On the mouth-tentacle pores there are seven or eight close-set, 
tooth-like scales on either side ; the next two pairs have six or seven on each 
side, just beyond the disk ; there are four scales on the inner side, and the same 
number of smaller ones on the outer, Color in alcohol, gray. 
Station 146, 1375 fathoms, 12 + specimens, Station 147, 1600 fathoms, 
12 + specimens. Station 157, 1950 fathoms, 12 + specimens. Station 158, 
(same species ?) 1800 fathoms, 1 very larga specimen. Station 160, 2600 fath- 
oms, 1 specimen. 
Ophioglypha fraterna sp. nov. 
Plate IV, Fig. 112. 
Special Marks. — Five very minute, blunt arm-spines, which often are 
rubbed off or naturally wanting. Disk smooth and flat, with scales, radial 
shields, and mouth-shields all small, and obscured by skin. No arm-comb. 
Description of an Individual (Station 157). — Diameter of disk 23.5 mm. 
Width of arm close to disk 3.7 mm. Mouth-papillw short, squarish, closely 
joined together, seven or eight on each side, diminishing in size inward, with 
three pointed aad longer at apex of jaw. Mouth-shield small, prodas than 
long, pentagonal, with outer edge rounded and obtuse angle within ; length to 
breadth:3 : 3. Side mouth-shields ocenfiying the inner angle of the mouth- 
shield, and passing beyond it; narrower without than within, where they 
meet, First under arm-plate much broader than long, with outer edge curved ; 
second plate six-sided, with inner laterals longest ; beyond the disk they are 
very broad, triangular, with long sharp lateral angles, an. obtuse angle inward, 
and the outer side curved, Often the lateral corners are broken off, and form 
separate pieces. Side arm-plates broad, not swollen, meeting below beyond the 
disk; separated above by the upper arm-plates, which are broader than. long, 
and broader without than within, having the outer edge wavy. Disk high and 
