98 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
Maxillule (Fig. 1d). The lobe (11) of the first joint (1) in its distal half 
rather narrow and curved, with numerous hairs at the rounded apex, but with- 
out any spine-like seta. The oblique terminal margin of the lobe (13) of the 
third joint, as in other species, with numerous long spines. 
Maxille (Fig. 1e). The lobe (1?) of the second joint proportionally rather 
narrow, with hairs along the interior margin and on the rounded terminal mar- 
gin; the two lobes (13) of the third joint with some long and robust sete at 
the apex. 
Maxillipeds (Fig. 1f). Second joint (2) rather long, with about sixteen 
coupling hooks (h) at the inner margin; the terminal margin of its lobe (12) 
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 (ep.) 
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 séventh 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 ; finally, 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, 
closely set with very small granulations, giving it a faintly scabrous appearance. 
While 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. 19) scarcely of medium 
