EUPHAUSIA DISTINGUENDA. 249 
in a small or nearly rudimentary, acute rostrum which is badly defined, broader 
or much broader than long, about half as long as the breadth of second antennu- 
lar joint or even conspicuously smaller. The gastric area well developed, with 
the median keel, seen from the side (fig. 3b), rather high and even slightly angular. 
Eyes rather small; eye-stalks a little longer in proportion to their distal 
breadth than in allied species and in very young specimens somewhat conspicu- 
ously long.— The antennular peduncles moderately strong; the proximal joint 
distally somewhat raised (fig. 3c) above the base of second joint, but the lobe 
may be termed rudimentary, as the terminal margin, seen from above (fig. 3d), 
is somewhat convex and with a small incision rather near the middle. Seeond 
joint at the upper outer distal angle with a rather short and high, oblique keel 
(figs. 3c and 3d, p.) directed upwards and somewhat forwards, forming almost 
an ear-like, rounded process; the distal upper margin of the joint from this 
process to the inner margin is somewhat oblique (fig. 3d). Third peduncular 
joint, seen from the outer side (fig. 3c), with its distal half occupied above by a 
high keel, highest at the middle and, if well preserved, with the distal upper 
angle rectangular and acute, the terminal margin a little concave and oblique.— 
The antennal squama is somewhat broad, less than three times as long as broad, 
tapering considerably towards the end so that the terminal transverse margin is 
short and there is no tooth from the outer angle; the spine-shaped process 
from the outer angle of the peduncle nearly one third as long as the squama. 
First and second abdominal segments slightly produced above at the middle 
of the posterior margin, but this produced part is tounded, scarcely angular. 
Third segment posteriorly produced in a spiniform, compressed process, from 
one third to nearly half as long as the following segment. Fourth and fifth 
segments without any trace of adorsal tooth. Sixth segment long, twice as long 
as deep. Preanal spine simple in both sexes.— Endopod of the uropods slightly 
longer than the exopod and as long as, or even a little longer than, the telson. 
The copulatory organs (figs. 3e-3f) show some peculiar features. The 
terminal process has a rather long foot and a very long, curved heel; the portion 
beyond the foot is moderately short, thick at the base, tapering considerably 
to beyond the middle where it is curved somewhat inwards, while its distal part 
is slender with the end scarcely acute. The proximal process (fig. 3f, p®.) has 
somewhat less than the proximal half stout and almost straight, then it bends 
abruptly considerably inwards and becomes rapidly thinner, being at the middle 
much narrower or even only half as broad as its proximal part; a little beyond 
the middle the inner side is almost abruptly considerably expanded, and this 
