60 G. 0. SARS. CRUSTACEA. [NORW. POL. EXP. 



The general form of the body (see PI. XV, figs. 1, 2) is rather robust, 

 resembling somewhat that of the species of the next genus (Chiridius). The 

 anterior division of the body is moderately vaulted above (see fig. 2), and, 

 seen dorsally (fig. 1), oblong oval in form, with the greatest width scarcely 

 more than Vs of the length, and occurring about in the middle. The anterior 

 extremity appears obtusely blunted, and the posterior, as usual, deeply emar- 

 ginated in the middle. The cephalic segment is coalesced with the 1st pedi- 

 gerous one, only a very slight constriction occurring between them, but no 

 distinct suture (see fig. 2). The last segment, on the other hand, is well 

 defined from the preceding one by a distinct, somewhat arcuate suture. This 

 segment is very small, and has the lateral parts somewhat produced behind, 

 terminating in a short, slightly deflexed, angular corner (see fig. 2). The . 

 rostral prominence is small, but distinct, terminating in a simple acute 

 point. 



The tail is comparatively short, scarcely exceeding Va of the length of the 

 anterior division. It is, as usual, composed of 4 segments, which are very 

 sharply marked off from each other, and each provided at the end with a 

 circlet of small spinules. Of the segments, the 1st, or genital segment is, as 

 usual, the largest, about equalling in length the 2 succeeding ones combined. 

 It has its greatest width beyond the middle (see fig. 1), and below forms a 

 rounded protuberance, to which, in the specimen examined, a small spermato- 

 phore was attached (see fig. 2). The last segment is rather small and 

 obliquely cut off on each side for the articulation with the caudal rami. 

 The latter are very short, being scarcely longer than they are broad, and are 

 somewhat divergent. They are finely ciliated inside, and each carry at the 

 tip 4 very strong and densely plumose setae of moderate length and but little 

 differing in size. Moreover, a small, unciliated bristle occurs on each ramus 

 outside the setae. 



Of any eye, no trace could be detected, though it is very likely that it 

 has existed in the fresh state of the animal. 



The superior antennae (fig. 8) are about the length of the anterior divi- 

 sion of the body, and are composed of 24 well-defined articulations, the 8th 

 of which, as in the preceding forms, is somewhat larger than the next adjacent 

 ones, and probably represents 2 united articulations. To the 1st articulation, 

 2 rather conspicuous plumose setae are attached. For the rest, the antenna 



