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206 COLLECTIONS EEOM MELANESIA.
it differs in the character of the tuberculation of the carapace and
legs. In the smaller examples tho tubercles are much smaller and
more acute, and these specimens have much the aspect of certain
Actoeoe, e. g. A . granulata, Audouin, and A. carcharias. White ; from
both of which'species they m ay b e distinguished upon the most
superficial examination by the smoothness of the sternum and postabdomen.
A small specimen from Tasmania in the British-Aluseum collection,
designated “ X peronii, AI.-Edw.,” in, I think, Prof._ A.
Alilne-Edwards’s handwriting, and two from Bass Straits, received
with fishes of H.Al.S. ‘ Challenger ’ collection, are intermediate between
this genus aud Actæa, and are principally distinguished by
the smooth, more distinctly separated and rounded tubercles of the
carapace and the longer spines of the ambulatory legs. I believe
the Xantho spinosus of Hess to be identical with A. peronii.
Actæodes polyacanthus*, from the Red Sea, comes very near this
species, but has five acute antero-lateral marginal teeth, &c.
Euxanthus maculatus, Haswellt (which is only known to me by
the author’s brief diagnosis), from Darnley Island, differs in tho
form of the teeth of the antero-lateral margins and the existence of
longitudinal rows of pits on the outer surface of the hands.
34. H y p o c o e l u s p i u i c t a t u s . ( P l a t e XIX. fig. B.)
The carapace is transverse, somewhat broader in proportion to its
leno-th than are specimens of H. sculptus in the Aluseum collection.
As In th at species it is everywhere strongly lobulated, the lobules
rounded, convex, and separated by deep intervening grooves, the
cervical suture being even wider and deeper than the rest ; the lobules
are rather coarsely punctulated. The front is rather obscurely
bilobated (besides the rounded lobe over the inner orbital angle); the
antero-lateral margins are strongly arcuated and cristiform, with
scarcely any indications of any antero-lateral teeth except the last,
which is small and little prominent ; the postero-lateral margins are
shorter than the antero-lateral margins and deeply concave. The
inferior parts of the body are more or less coarsely p itted ; the
pterygostomian cavity is smaller than in II. sculptus, but rather
wider than in a specimen of II. granulatus in the Aluseum collection,
nearly ovate in outline, and divided along its greatest width by a
crest running parallel to th at part of the antero-lateral margin th at
borders the cavity above. The basal antennal joint enters the inner
orbital hiatus, but not so deeply as in H. sculptus. The chelipedes
resemble those of H. sculptus ; the wrist and palm, however, are
strongly pitted on their upper and outer surfaces, whereas in speci-
mens°of H. sculptus iu the Aluseum coUection these pits are absent
from the wrist and from the upper surface of the palm. Eingers
* Chlorodius poly acanthus, Heller, Sitz. Akad. Wien, xliii. (i.) p. 339, pi. ii.
fig. 21 (1861).
t Proc. Linn. Soc. N. S. Wales, vi. p. 751 (1881) ; and ‘Catalogue,’ p. 48
(1882).
CEUSTACEA. 207
nearly as in H. sculptus. The ambulatory legs are slender, with
the penultimate and antepenultimate joints rugose and pitted. The
colour (in a spirit-specimen) is reddish upon a yellowish ground.
Length of carapace 8 | lines (18 millim.), breadth about 1 inch
(25 millim.).
A single male was obtained a t Thursday Island, 3 -4 fms.
(No. 175).
I t may be at once distinguished from Hypocoelus sculptus (Al.-
Edwards) and H. granulatus (De Haan) by the crest or ridge
dividing the cavities of the pterygostomian regions (fig. 6).
The species of this curious genus appear to be rare. I have seen
no specimens of H. punctatus except the unique type example. Of
H. sculptus there are in the Aluseum three specimens—one from
the Red Sea (J. Burton), one from the Gulf of Suez (B. MacAndrew),
and one from the Alauritius. Of H. granulatus there is but one
specimen, a mutilated male without indication of locality, in the
national collection.
35. Atergatis floridus (Linn.).
Of this very common and widely distributed species five specimens
(males and females), obtained on a coral-reef at the Clairmont
Islands, N.E. coast of Australia (No. 151), are retained for the British
Aluseum.
Specimens are in the national collection from Port Essington,
Trinity Bay {J. Alacgillivray, H.Al.S. ‘ Rattlesnake ’), and Swan
River {II. Dring) ; also from Port Natal (purchased), and from
the Philippine Islands, Guimaras {II. Cuming) ; Java, Karang-
bollong, and Amboina {Dr. P. B l e e k e r ) Indian Ocean {Old
CoUection); Ceylon, Galle {Dr. W. Ondaatje); Duke of York
Island {Bev. G. Brown); Sunday Island {J. B. Juices) ; Alinerva
Reef {H.Al.S. ‘ Herald’); Eiji Islands, Ovalau, Totoya {H.Al.S.
‘ Herald’) ; Samoa Islands, Upolu {Bev. S. J . Whitmee) ; and others
with less definite indication of locality.
36. Lophozozymus epheliticus (Linn.).
Port Alolle (No. 95). A small male, having the beautiful coloration
usual in this common species, was ohtained on the beach.
Air. HasweU mentions its occurrence a t Cape Grenville (as L. octo-
dentatus).
Specimens are in the collection of the British Aluseum from New
South AVales (G. Krefft); Darnley Island {J. B. Jukes); Nicol
Bay, N.W. Australia {Air. Du Boulay) ; Philippine Islands (Gtfmmq);
Java {Bleeker Collection); and others without definite locality.
The coloration, both in dry and spirit specimens, is variable;
ordinarily carapace and legs are crimson or orange-red with white
spots, but sometimes the white greatly predominates, and the red
forms irregular patches and reticulating lines.
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