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316 COLLECTIONS FROM MELANESIA.
segments and fourth and fifth segments exist ooly on the dorsal
surface, hut on the third extend down to the rounded postero-lateral
angles ; in the second segment the posterior margin above the
rounded postero-lateral angles is obscurely dentated. The lobes of
the terminal segment are suhconical and tipped with one or two
setæ. The eyes are oval, but very obscurely seen. The penultimate
joint of the peduncles of the superior antennæ is slightly longer
and slenderer than the preceding ; the third joint, with which the
short accessory fiagellnm is articulated, is very short ; the fiagella
are themselves imperfect ; the accessory flagella about 6-jointed.
The inferior antennæ aro much shorter than the superior ; the first
peduncular jo in t little more than half as long as the second, which
is about as long as the th ird ; the flagella 12-14-jointed. The first
legs are slender and feeble ; the merus-joints very small, with posterior
acute lobe and tooth ; the carpus resembles the propus or
palm, having the posterior margin convex, rounded, and hairy ; the
dactjd is a little more than half as long as the palm. The second
legs have the carpus very short, propns considerably enlarged, longer
than broad, its distal margin oblique, slightly arcuated, and defined
by a small tooth ; dactyl slightly arcuated, and closing against the
distal margin of the propus. The three posterior legs are slender ;
the margins of the fourth to sixth joints with a few stiff hairs.
The uropoda are hirámose, the rami in the penultimate and antepenultimate
pairs snhequal ; the last pair are wanting in the three
specimens I have examined.
Another specimen from Port Jackson, 0 -5 fms., which I refer
doubtfully to this genus (it having lost the head), and which I cannot
identify with any known species, has the body smooth and u n armed,
the first three postahdominal segments with a small spinule
at their postero-lateral angles ; the terminal segment has the lobes
flattened and suhacute distally. The first legs are small, with the
carpus and propus posteriorly arcuated, the carpus little shorter
than the propns. The second legs have the merus-joint short, hut
little produced at its postero-distal angle ; carpus transverse, dilated
in its distal half, which equals the width of the palm at base ; palm
longer than broad, narrower distally, with the distal margin very
oblique, not acute, hut presenting a broad surface, against which
the strong arcuate dactyl closes, and armed with four spines or lobes
as follows—one defining the postero-distal angle, a pair of small
spines in front of this, and a rounded lobe below the articulation of
the palm with the dactyl. The three posterior legs are rather
robust, w ith the hasus-joints not serrated ; the merus produced at its
anterior and distal angle. The outer ramus of the penultimate and
antepenultimate uropoda is slightly shorter than the inner ramus ;
the rami of the last pair snhequal, broader and slightly shorter than
the preceding.
This species, which may be designated provisionally AI. crassimana,
is apparently well distinguished by the form and dentition of the
palms of the second pair of legs.
There is also in the collection a specimen which may belong to
CRUSTACEA. 317
this genus or to Alegamcera, from Port Jackson, 5 -7 fms. (No. 104),
hnt which, having lost both pairs of antennæ and the terminal segment,
cannot be referred to any genus with certainty. I t is distinguished
from the various species described by Mr. Haswell by the
great length of the first legs, which exceed the logs of the second
pair in length, and have the merus considerably produced at tho
postero-distal angle, the carpus about twice as long as the propns
and truncated at its distal end, propus posteriorly arcuated, dactyl
about half as long as the propns : the legs of the second pair have the
merus short, carpus more than half as long as the palm and tru n cated
a t its distal extremity ; palm or propus considerably enlarged,
its distal margin oblique and nearly straight, defined at the postero-
distal angle by a small spine, and with a truncated lobe or tooth
nearer the base of the dactylus, which is strongly arcuated and
does not reach quite to the postero-distal angle of the palm. The
coxæ of the four anterior legs are deeper than the segments with
which they are articulated. The three posterior legs slender, with
the hasus-joints little dilated and posteriorly entire, the merus-
joints not distally produced into lobes or teeth. The uropoda are
hirámose, the rami subequal, those of the posterior pair very small,
not foliaceous. The segments of the body are without teeth, spines,
or spinules. The coloration (in spirit) whitish, the body covered
with numerous small black dots.
In the form of the anterior legs and in the. coloration it resembles
Ampliithoe setosa, Haswell, from Botany Bay, hut differs in the form
of the palm of the second leg, and, I suppose, of the posterior
uropoda.
7. Megamoera suensis, HasweU ?
As Air. Haswell’s description is very short aud our specimens differ
slightly from his figure in the form of the second legs, I append the
following description:—Body rather robust; head with a small
lateral tooth behind the antero-lateral angles. Coxæ of the first
four thoracic limbs deeper than their respective body-segments, the
first pair not much prolonged at the antero-lateral angles, which are
rounded or suhacute. The last thoracic segment and the first and
second postahdominal segments have their posterior margins armed
with two small dorsal spines ; the third is dorsally emarginate hut
without spines ; the fourth has its posterior and dorsal margins
armed with two strong triangulate acute lobes or teeth. The first
and second postahdominal segments have a small spinule at their
postero-lateral angles; the third segment has its postero-lateral
angles truDcated and armed with three to five teeth; the lobes of
the terminal segment, which are subcylindrical, are tipped with a
few setæ. The eyes are oval, black. The antennæ are somewhat
hairy the superior antennæ are broken, but exceed the head and
thoracic segments in length ; the basal peduncular joints are thicker
and somewhat shorter than the second joints ; the third joints very
short ; the slender accessory flagellum is composed of three rather
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