98 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



MaxillulcB (Fig. 1 d). The lobe (l^) of the first joint (1) in its distal half 

 rather narrow and curved, with numerous hairs at the rounded apex, but -i^-ith- 

 out any spine-like seta. The oblique terminal margin of the lobe (I ^) of the 

 third joint, as in other species, with numerous long spines. 



Maxilhe (Fig. 1 e). The lobe (Z'^) of the second joint proportionally rather 

 narrow, with hairs along the interior margin and on the rounded terminal mar- 

 gin ; the two lobes (l^) of the third joint with some long and robust setae at 

 the apex. 



Maxillijoeds (Fig. If). Second joint (2) rather long, with about sixteen 

 coupling hooks (h) at the inner margin ; the terminal margin of its lobe {I ^j 

 coarsely serrated and hairy. Fourth and fifth joints, as in other species, much 

 expanded, but not to such a degree as, for instance, in the following species ; 

 the fourth joint conspicuously narrower than the second, and considerably larger 

 than the fifth. Sixth and seventh (7) joints small and slender. The epipod (eih) 

 with a somewhat produced acute angle at the middle of the exterior margin. 



Thorax. As usual in this genus, the thorax is divided into two parts, the 

 first of which, consisting of four segments, in this species equals in length the 

 second part. The first segment considerably narrower than the second, the fifth 

 nearly twice as broad as the first. The four anterior segments with a trans- 

 verse depression in a considerable part of the breadth. The first segment 

 with a single small dorsal process. Second, third, and fourth segments each 

 with a median, very high, laterally compressed, acute dorsal process, turning 

 obliquely forward and rising just behind the anterior margin ; besides, the 

 second and third segments with a short rounded protuberance in the median 

 line a little in advance of the posterior margin. The third and the fourth seg- 

 ment with the antero-lateral angle produced into an acute, almost spine-like 

 process ; on the first two segments the same angle is rounded. The three pos- 

 terior segments with a median, longitudinal, rather broad impression, on each 

 side limited by a low keel, anteriorly produced into an acute process, which is 

 long on the fifth and short on the seventh segment. The antero-lateral angle of 

 the three last named segments produced into an acute process, turning forward 

 and somewhat outward, the process being long on the fifth segment, shorter, 

 but almost broader on the last two segments ; finaUy, on the lateral margin a 

 little in advance of the posterior angle, a protuberant rounded process, which is 

 very low on the fifth segment, somewhat larger on the two others, especially 

 on the last one. The whole dorsal surface of the trunk, as of the abdomen, 

 closelv set with very small granulations, giving it a faintly scabrous appearance. 

 WhUe the first segment is movably jointed with the head, and the articulation 

 between the four anterior segments, and especially between the fourth and the 

 fifth segment, is very well developed, the three posterior segments are im- 

 movably connected with one another and with the abdomen. 



Thoracic Legs. The basal joint of the four anterior pairs with the antero- 

 lateral angle produced into a rather good-sized, distally almost spine-like acute 

 process, and laterally with a shorter projecting process ; the basal joint of the 

 three posterior pairs smooth. The first pair (Fig. 1 g) scarcely of medium 



