159 
slightly downward, for about half the length of the carapace, 
and between this hepatic ridge, which is very pronounced, 
and the lateral margin is another faintly marked, which 
bifurcates behind and soon disappears. The lateral margin 
of the carapace forms an obtuse angle immediately over the 
base of the third pereiopod. ^ Posterior to these ridges und 
higher up is another short, oblique ridge, divided into two 
anteriorly abrupt portions, and higher still and more pos- 
terior there is a short, slightly sigmoid ridge, whose end 
reaches close to the posterior margin of the carapace, and in 
the  postero-lateral region there are two short, slightly 
oblique ridges with very obtuse anterior ends. "These have a 
few faintly marked, scale-like projections preceding them. 
The antenal and hepatie regions also have a few short, scale- 
like projections, viz., one a little below and behind the eye, 
with two or three more higher up about the middle of the 
carapace, and one or two on the antennal region. 
The pleon narrows considerably after the third segment 
both laterally and vertically, it is much sculptured, and the 
second and third segments are strongly humped in the 
middle line. The first segment is very short, and very 
slightly overlaps the carapace. The three posterior segments 
also are short and broadly but not deeply keeled dorsally, 
they are marked with one or more scale-like ridges on the 
sides; the second and third are more sculptured above and at 
the sides than the others, and are only moderately produced 
at the sides. The sixth segment is longer than either of the 
two preceding ones, it is much overlapped at the sides by the 
fifth, and ventrally has a broad, preanal lobe bearing two 
acute prominences. 
The telson is a little longer than the sixth segment, it is 
rather broad, especially at the base, medianly sulcate above, 
rounded at the distal end, and ciliate, but not spined, dor- 
sally there are two scales on each side of the median sulca- 
tion, occupying the place of the usual quadrately placed 
spines. 
The appendages are mostly short. 
The eyes are as stated above. 
In the antennules the first joint of the peduncle is hidden 
under the carapace except its lateral lobe. The peduncle 
does not extend much further than the rostrum. The upper 
fagellum does not reach as far as the antennal scale, the 
lower one is very small. 
The antenna arises in a recess of the anterior margin, its 
scale has a small triangular process situated near its base on 
the upper surface. The distal peduncular portion is scarcely 
more than half the length of the scale, the flagellum is 
slender and very short. 
