This species is very nearly allied to the British Podocerus falcatus,
Montagu (of which the male is figured by Sp. Bate and WesWood as
P. pidchellus), and also to P. validus (Dana), from Kio de Janeiro,
in the form of the legs of the second pair. I have not been able to
compare it with specimens of the last-mentioned species. From
P. falcatus it is apparently distinguished by the inferior antennae,
whose flagellum (in the specimens of P. australis I have examined)
has a very long stout basal joint which much exceeds the united
length of the remaining joints of the flagellum; these are two or
three in number, very short, and diminish successively in length.
10. Caprella aequilihra (Na?/).
A good series of specimens were obtained from weed on the ship’s
bottom at Port Jackson with Podocerus australis.
Mr. Haswell’s examples (designated C. obesa) were from Clark
Island in the same harbour.
All appear to be males. A conical spine, not mentioned by Mr.
Haswell, exists on the ventral surface of the body, between the
second pair of legs (gnathopoda).
A female ohtained with the foregoing, and which probably belongs
to the same species, has the joints of the peduncle of the superior
antenme less dilated and the fiagellnm more elongated ; the hasus-
joints of the second gnathopoda are less d ila ted ; hut one of the
distal teeth of the inferior margin of the palm is developed, and
this is very indistinet.
I may refer to Dr. Paul Alayer’s recently published fine monograph
of the Caprellida; * for the synonyms of this very widely distributed
species. There can he no doubt of the correctness of his
identification of C. obesa, Haswell, with C. cequilibra (Say). Say’s
specimen iu the British-Aluseum collection, although dried and in a
somewhat shrivelled condition, does not differ appreciably from our
Australian examples, nor from a specimen from the Alediterranean
(Hennah), and the dried one from Hong Kong {Harrington) in the
Museum collection, which was identified with C. aquilihra^ by Mr.
Spence Bate. Out of three (presumably) British examples in spirit
in the Museum collection, designated C. cequilibra by Mr. Sp. Bate,
one only belongs to this species, aud this also does not differ from
the Australian examples.
11. Caprella attenuata, Dana ? (P late XX XIV. fig. C.)
I refer here with much hesitation a male obtained at P ort J ackson
with Caprella cequilibra. I t differs from C. attenuata as figured
by Dana aud by Dr. Alayer {t. c. p. 67) in the much more robust
* In ‘ Fauna und Flora des Golfes von Neapel,’ vi. p. 45, pi. i. fig. 7, pL ii.
fig.s. 1-11, pi. iv. figs. 20-25, pi. V. figs. 16-18 (1882).
and shorter segments of the body and peduncular joints of the
superior antennse, relatively longer inferior antennse, &c., as a comparison
of the figures will show; but as Alayer refers to this species
(founded upon types from Bio de Janeiro) specimens sent to him by
Air. Haswell from Port J ackson, and our specimen agrees with Dana’s
figures of the male in the denticulation of the palms of the second
legs and in other characteristic points, I do not venture to regard it
as distinct.
Caprella novcB-zecdandice of Kirk * comes very near this species,
hut differs in the form of the non-ciliated joints of the flagellum of
the superior antennse, and the penultimate joint of the second legs is
armed (apparently) with hut two teeth. Both C. novce-zecdandim
and Protella austrcdis, which greatly resemble this species, have a
spine or tooth on the penultimate joint of the three posterior legs, of
which scarcely any indications exist in the specimens I refer to
C. attenuata.
Two other very small Oaprellce, also obtained at Port Jackson,
are in tho collection, which I am unable to identify with certainty,
but do not think it de.sirable to designate by a distinct specific
name.
OSTEACODA.
The few Ostracoda collected were submitted to Dr. G. S. Brady
for determination, who referred them to the following species:—
1. Cypridina alho-maculata, Baird.
The specimens collected were from Port Darwin, 12 fms., aud
Dundas Straits, 17 fms. (Xo. 161). The original types were from
Western Australia, Swan Biver.
CIRRIPEDIA.
1. Balanns trigonus, Darwin.
Numerous specimens (mostly small) were obtained at Port Jackson,
0 -5 fms. (No. 90). Darwin records it from Sydney, and
mentions its distribution through the Malaysian seas and its occurrence
at New Zealand and also on the W. coast of the American
continent.
2. Balanns amaryllis, Darwin.
A specimen from the beach at Port Darwin (No. 176), and
several small specimens from Albany Island, 3 -4 fms., attached
to a shell, appear to belong to this species. In the two largest
specimens, however, whose opercula I have examined, the scuta
I 'i