Indian Deep-sea Dredging. | 269 
straight or very slightly concave lines to the triangular apex ; 
its dorsal surface, which is covered with a furry coating of 
minute appressed spinules, is transversely convex and tra- 
versed longitudinally by a deep groove, while its ventral 
surface is deeply excavated gutter-like and glabrous. 
The eye-peduncles are very small and immovably re- 
tracted outwards against the extraorbital angle, being anky- 
losed at base to the ophthalmic sternum; a distinct con- 
striction limits off a wider and almost spherical apical or 
corneal portion from a narrower basal portion; the latter 
bears on its inner and inferior side, near the base, a minute 
papilla; the corneal portion is smooth and polished, and does 
not exhibit the slightest trace either of superticial faceting or 
of subjacent pigmentation; the eyes appear, in fact, to be in 
exactly the same degenerate condition as those of Nephropsis 
Stewartt, and it is certain can be capable at most of appre- - 
ciating differences in the intensity of the light. 
The peduncle of the antennules is subcylindrieal ; its first 
joint is about equal to the two remaining joints taken: 
together, crested on the infero-internal margin, the crest 
running into an acicular spine some distance from the apex, 
and produced at its outer base into an oval digitate scale-like 
process; the second and third joints subequal, the latter 
armed with an acicular spine about the middle of its extero- 
superior face; flagella equal in length, the outer the thicker 
(much the thicker in @), and bearing olfactory filaments to 
within a short distance of its extremity. 
The second joint of the antenna is armed with three spines 
on the outer apex; the scale is a narrow, firmly chitinized, 
oblong plate, with an acute triangular somewhat inturned 
point; it is strengthened and stiffened not only by its greatly 
thickened outer margin, which terminates some distance 
from the apex of the part in a prominent spine, but also by a 
stout midrib and a slight thickening of the apical and inner 
margins. The flagellum is very long. 
The mandible is very distinctly divided into molar and 
incisive processes by a deep and almost rectangular notch, in 
which the palp is lodged. ‘The incisive process is a thin, 
excessively sharp, and slightly recurved knife-like plate. 
The stout molar process may_be described either as an irre- 
gular four-sided prism with one angle broadly rounded off or 
as an irregular three-sided prism with one side convex; its 
trapezoidal or subtriangular masticatory surface is concave 
with sharp edges. ‘The palp is robust, two-jointed; the 
apex, with the greater part of the inwardly directed outer 
edge of its oval terminal joint, is beset with stiff setee. 
