EUPHAUSIA DISTINGUENDA. 240 



ill a small. or iicarlj* rudiineiUary, acute rostrum which is badly tlclincd, ijroader 

 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 cvvn 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. Second 

 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 rounded, scarcely angular. 

 Third segment posteriorly produced in a spiniform, compressed process, from 

 one third to nearly half as long as tlie following segment. Foiu'th and fifth 

 segments without any trace of a dorsal 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, cur\ed 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 



