i !
57. Pilumnus semilanatus. (P late X X II. fig. B.)
The carapace is not very convex; a fcAV granules exist near the
antero-lateral te e th ; its anterior part (i. e. the frontal and postfrontal
regions and parts adjacent to the antero-lateral margins) is
clothed with longish hairs, which are altogether absent from the
gastric, cardiac, and branchial regions, which are nearly plain and
smooth; the cervical suture only is distinct in some specimens ;
the frontal lobes are scarcely defined by a median notch, and are
verj^ little prominent; the antero-lateral margins much shorter
than tho postero-lateral, and armed with three teeth, the first of
which is blunt and is itself crenulated, the second dentiform, and
the third very sma ll; no tooth exists a t the exterior angle of the
orbit, hut immediately" behind it are sometimes one or two small
granules ; the orbital margins are rather ohscurel}^ denticulated ;
the pterygostomian regions nearly smooth ; all the postabdominal
segments aro distinct; the basal antennal joint barely reaches to
the subfrontal process ; the merus-joint of the outer maxillipedes is
nearly quadrate. The chelipedes are of moderate size ; arm with a
small spine near the distal end of its upper margin; wrist granulated
externally, the granules inconspicuous, and with a small spine
on its inner margin ; palm also granulated above and externally, the
granules large and showing a tendency to disposition in longitudinal
series, and becoming more crowded toward the lower margin ; fingers
brownish, the coloration not extending over the palm ; legs slender
and proportionately rather long. Length of the largest perfect
specimen rather over 4 lines (9 millim.), breadth 5 lines (nearly
11 millim.).
Three small specimens (a male and two females) are in the
first collection, but unfortunately Avithout definite locality; the label
with particulars respecting habitat (if there existed any) was lost
when the bottle (No. 123) came into my hands. In the second
collection two males from Prince of Wales Channel, 7 -9 fms.
Either the left or the right hand may be the larger.
There are in the collection of the British Aluseum a male and a
female specimen preserved dry, and collected by Air. J. Alacgillivray
(H.Al.S. ‘ Eattlesnake ’) off Cape Capricorn, in 15 fathoms, on a muddy,
sandy, and shelly bottom, th a t I refer to this species ; also an adult
male from Aloreton Bay (purchased). The coloration of Dr. Coppinger’s
spirit-specimens is purplish, th a t of the dry examples reddish
hroAvn.
This species bears some slight resemblance to P. monilifera, Haswell,
from Tasmania {vide Cat. p. 65, pi. i. fig. 3), which, however,
has the carapace and limbs covered with a short close pubescence,
and the front much more deeply incised, the carapace more granulated.
58. Pilumnus seminudus. ( P late XXI. fig. C.)
This species resembles the foregoing in having the gastric, cardiac,
and branchial regions of the carapace smooth and naked ; hut it may
he at once distinguished by the following characters:—The carapace
is broader in proportion to its length, and its anterior parts clothed
with a close velvety pubescence, which also extends over the upper
and outer surface of the wrist and palm of the chelipedes ; the two
posterior teeth of the antero-lateral margins are more distinctly
spiniform, the basal antennal joint does not nearly reach to the snb-
frontal process ; the granulations of the wrist and palm are much
more inconspicuous, those of the outer surface of the palm appear,
through the pubescence, to be arranged in four distinct longitudinal
series (fig. c) ; the ambulatory legs are slenderer.
Colour (in spirit) purplish brown, hairs cinereous. Length of the
largest specimen, a female, about 5 | lines (nearly 12 millim.),
breadth about 7 | lines (16 millim.).
There is a male in the first collection from Port Denison, 4 fms.
(No. I l l ) , and a female in the second collection from Thursday
Island, 4 -5 fms. (No. 165).
Air. Haswell has described a species (Pilumnus inermis*) from
Port Jackson whieh apparently resembles this and the preceding
species in having the anterior parts only of the carapace clothed
with hairs, which are long as in P. semilanatus. I t differs, however,
in the less distinctly toothed antero-lateral margins of the
carapace, in the form of the front, which is entire, not notched, and
in the disposition of the granules of the chelipedes, both from P.
semilanatus and P. seminudus.
Pilumnus loevimanus, D a n a t, is apparently allied to this and the
foregoing species, hut has the carapace almost wholly naked, and
the larger hand rounded above and quite smooth, with only some
faint traces of minute tubercles toward the base. I t has been recorded
from Borneo and New Caledonia.
In Pilumnus nitidus, A. Al.-Edwards+, from New Caledonia,
which is another nearly allied species, the tAvo anterior teeth of the
antero-lateral margins of the carapace are obsolete.
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59. Pilnmmis cursor ?
? Pilumnus cursor, A. M.-Edioards, Nouv. Archiv. Mus. Hist. Nat.
ix. p. 244, pi. ix. fig. 4 (1873).
In the specimen I thus very doubtfully designate the carapace
is nearly smooth, with the anterior portion moderately deflexed,
antero-lateral margins much shorter than the posterolateral,
which are nearly straight and convergent posteriorly ; both
carapace and limbs are scantily clothed with very short hairs,
among which a few longer hairs are interspersed ; the frontal lobes
are divided by a rather deep and wide median fissure; the anterolateral
margins are armed with three spines, besides a smaller but
distinct spine a t the exterior angle of the orbit. The basal antennal
* Proc. Linn. Soo. N. S. Wales, vi. p. .544 (1881); Catalogue, p. 70 (1882).
t Crust. U.S. Expl. Exp. xiii. p. 237, pi. xiii. fig. 11 (1852).
I Kouv. Arch. Mus. ix. p. 249, pi. x. fig. 2 (1873).