th and the inferior angle.

_Maxillae_, with the two upper spines very large; beneath them there are
two small spines, and a considerable notch; the inferior part of the
edge is nearly straight, bearing about thirteen pairs of spines,
obscurely divided into two groups, the lower spines being smaller than
the upper ones. The upper convex margin is hirsute with long hairs.

_Outer Maxillae_, blunt, with the inner margin slightly concave;
continuously, but thinly clothed with spines.

_Cirri._--The segments of the three posterior pairs bear four pairs of
spines, with the usual intermediate fine spines; dorsal spines thin and
thick mingled together. _First cirrus_, short, with the anterior ramus
rather the thickest and shortest; all the segments thickly paved with
bristles, except the two terminal segments, of which the ultimate one
bears some serrated spines of most unusual length, namely, equalling
within one segment the entire length of the ramus. I presume that these
spines serve as feelers. _Second cirrus_; anterior ramus much thicker
and considerably shorter than the posterior ramus; six basal segments
paved with bristles, the two terminal segments having the usual
structure; posterior ramus with all its nine segments on the usual
structure. _Third cirrus_, longer, to a remarkable degree, than the
second cirrus, with its anterior ramus having the four basal segments
paved, and the seven terminal ones on the usual structure; posterior
ramus with twelve segments, of which none are paved. The pedicels of the
second and third cirri thickly and irregularly clothed with spines. The
upper segments of the pedicels of all the cirri are unusually long.

_Caudal Appendages_, longer than the pedicels of the sixth cirrus, by
barely one third of their own length. Segments much elongated, seven in
number; I may add for comparison that each ramus of the sixth cirrus
contained, in this specimen, sixteen or seventeen segments.

_General Remarks._--It is difficult to give obvious characters,
(excepting the smallness of the rostrum compared with the scales on the
peduncle,) by which this species can be externally discriminated from
_L. dorsalis_, _L. Nicobarica_, and _L. Rhodiopus_; yet almost all the
valves differ slightly in shape. In this species alone, (the peduncle of
_L. Rhodiopus_ is not known,) the lower, microscopically minute,
bead-like scales of the peduncle are crenated, though obscurely, all
round. In the animal's body,