the diagnostic characters are strongly
marked;--the long spines on the terminal segment of the first
cirrus,--none of the segments in the posterior rami of the second and
third cirri being thickened and paved with bristles,--the pectinations
being equal in number between the main teeth of the mandibles,--are all
characters exclusively confined to this species.

3. LITHOTRYA NICOBARICA. Pl. VIII, fig. 2.

L. NICOBARICA. _Reinhardt_, Naturhist; Selskabet, Copenhagen. No.
I. 1850. Tab. I, fig. 1-3.[68]

[68] I am not at all sure that the proper title of the periodical
in which this species has been described, is here given. I am
greatly indebted to Prof. Steenstrup for sending me a separate
copy of the paper in question, written in Danish. I believe I am
right in identifying the specimen here described, from Timor,
with the species from the Nicobar Islands, named by Reinhardt,
_L. Nicobarica_.

_L. scutis terga anguste obtegentibus: carinae crista interna tenui in
parte superiore posita: rostro conspicuo, squamarum sex subjacentium
latitudinem aequante: lateribus, superficie interna triangula, squamarum
septem subjacentium latitudinem aequantibus._

Scuta narrowly overlapping the terga: carina with a slight central
internal ridge in the upper part: rostrum conspicuous, as wide as six of
the subjacent scales: latera, with their internal surfaces triangular,
as wide as seven of the subjacent scales.

Palpi square at their ends: mandibles with twice as many pectinations
between the first and second main teeth, as between the second and
third: maxillae slightly notched, with the inferior angle slightly
prominent: caudal appendages more than twice as long as the pedicels of
the sixth cirrus.

Timor; Brit. Mus., (given by Cuvier to Leach); Nicobar Islands,
according to Reinhardt.

Capitulum as in _L. dorsalis_. The teeth on the prominent rims of the
valves are small and approximate; but the specimen was much worn.

_Scuta_, triangular, slightly overlapping the terga; the line of
junction between these valves slightly sinuous, the upper part of the
tergal margin of the scuta being slightly hollowed out, and the
corresponding upper portion of the margin of the terga being slightly
protuberant. Internally, there is a considerable depression for the
adductor muscle; and besides the usual knob at the rostral angle, there
is a trace of a knob at the baso-tergal angle.

_Terga_, as