arc slender ; dactyli short, terminating in a small claw. Colour (in
the spirit-specimen) pale reddish yellow, punctulated with darker
red. Length nearly 7 lines (14 millim.), breadth a little over 6 lines
(13 millim.); length of chelipede about IL inch (34 millim.).
An adult female is in the collection from Thursday Island, ohtained
on the beach (No. 167).
There is also in the Museum collection a female from Port Curtis,
Facing Island, two examples from Torres Straits (J. B. Juices), and
two from the ‘ Samarang ’ collection, of which one is from Koo-
Keang-San.
The three distinct spines on the posterior margin of the arm seem
to distinguish this form from the P. hellis of Heller, from the
Nicohars—a species, however, which is ouly briefly characterized.
I t is evidently very nearly allied to Petrolisthes rugosus (M.-
Edwards), to which are referred specimens in tho British-Aluseum
collection from Karachi (Karachi Aluseum) and North Australia
(Dr. J . B . Elseg), which species, however, has the carapace and
chelipedes covered with well-defined pilifcrous crests, and the teeth
of the anterior margins of the wrists much more regular in form
and disposition.
14. Petrolisthes annulipes. ( P l a t e XXIX. fig. B .)
Petrolisthes annulipes, White, List Crust. Brit. AIus. p. 63 (1847),
descript, nullâ.
Carapace moderately convex, scarcely longer than broad, its upper
surface and also th at of the chelipedes transversely striated ; the
striæ imbricated and fringed on the anterior margins with close-set
short setæ ; the front is subtriangulate, moderately prominent,
slightly concave above, with the apex rounded or subtruncated, and
the margins usually minutely spinulose ; there is a spine on the
upper margin of the orbit ju st in front of the eye-peduncles ; the
sides of the carapace are armed with about six spines, the first of
which (when present) is situated ju st posterior to the outer orbital
angle, the second a little behind it, the third a little within the
margin on the front of the branchial region, and the other three on
the sides of the branchial region and close to one another. The
first exposed joint of the antennæ is armed with a spine (see fig. h).
The ischium- and merns-joints of the outer maxillipedes are transversely
striated and setose, like the carapace ; the last three joints
fringed on their inner margins with very long hairs. The merus-
joint of the chelipedes is armed with a denticulated lobe at the
distal end of its inner margin ; the carpus or wrist has five denticulated
teeth on its anterior margin, and three or four spines on its
posterior margin ; the palm is armed with a series of minute spinules
on its outer or posterior margin ; the fingers meet along their
inner edges, and have their tips incurved and acute. The ambulatorv
legs are somewhat hairy, the merus-joints in the first three pairs
transversely striated aud setose, and armed with spinules on their
anterior margins ; in the first two pairs there is also a small spinule
at the distal end of the posterior margin. Ground-colour yellowish ;
the transverse imbrications of the carapace and legs are red ; the
carpus- and merus-joints of the ambulatory legs are also banded with
red. Length and breadth of the carapace of the largest specimen
(a female with ova) a little over 4 lines (9 miUim.), of chelipede,
when extended, 9 | lines (20 millim.).
Two adult females and three males (one very small) are in the
first collection from Port Denison, 4 fms. (Nos. I l l , 122), and a
small male from Port Alolle, 5 -12 fms. (No. 118) ; in the second
collection is an adult female from Prince of AVales Channel, 7 fms.
(No. 169), and two small specimens from Thursday Island, 4 -5 fms.
(No. 165).
The description is taken from the largest female ; in the smallest
specimen the anterior margin of the front is minutely denticulated.
There are in the British-Museum collection three specimens obtained
off Cape Capricorn (15 fms.). AVhite’s typical specimen is
from the Philippine Islands, Corregidor (Cuming).
In the last consignment received from H.M.S. ‘ Alert ’ are specimens
from the Seychelles.
This species cannot, I think, be confounded with any of the
numerous Oriental forms described by Milne-Edwards, Dana, Stimpson,
and Heller.
I t is evidently nearly allied to P. scabricula, Dana *, from the
Sooloo Sea, and to P. militaris, Heller f , from the Nicohars, in both
of which the spinulation of the carapace is different and the palms
of the chelipedes externally pubescent. In P. scabricula the series
of spines along the posterior margin of the wrist seem, to extend
along its whole length ; and Heller makes no mention of the prominent
spine on the upper margin of the orbit in his description of
P. militaris, which in P. annulipes seems to occupy the position of
the obtuse-lateral frontal lobes mentioned in his description.
Air. Haswell (Catalogue, p. 146) refers certain specimens collected
at Port Denison to the Petrolisthes dentatus of Al.-Edwards t ; but as
he only cites M.-Edwards’s very short diagnosis and adds nothing
respecting the Australian specimens, I am unable to say whether
they are distinguishable from the species I have designated P. haswelli
or from P. annulipes. M.-Edwards’s types were from Java, and
seem to be distinguished from the Australian species by having the
posterior margin of the carpus of the chelipedes “ dentelé en scie.”
15. Petrolisthes? corallicola (Haswell)^ ( P l a t e XXIX. fig. C.)
? Porcellana corallicola, Haswell, Proc. Linn. Soc. A*. S. Wales, vi.
p. 759 (1881) ; Cat. Austr. Crust, p. 150 (1882).
Carapace much longer than broad, the gastric and hepatic regions
U.S. Expl. Exp. xiii. Crust, i. p. 424, pi. xxvi. fig. 13 (1852).
t Crust, in Reise der Norara, p. 75 (1865).
I Hist. Nat. Crust, ii. p. 251 (1837).
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