have the articular ridges somewhat reflexed. For its distribution
see Darwin’s monograph (p. 279), by whom it is recorded from
Moreton Bay.
3, Acasta sulcata, Lamarck, var.
A single specimen in the collection from Albany Island, 3 -4 fms.,
is very doubtitdly referred to this species. I t agrees generally in
its external characters with Mr. Darwin’s description, and also in
the broader spur of the tergum of the operculum. In the remarkable
reduction of the width of the parietes of the carino-latcral compartments
it altogether resembles a specimen from Sydney iu Air.
Cuming’s collection (now in the British Aluseum) specially referred
to by Air. Darwin* ; but it differs very remarkably in the external
armature of the parietes of the other compartments, which are
armed with strong, outwardly-projecting, hluntly-triangnlate lobes
or teeth, one such tooth being situate on each compartment, not
very far below the apex, except on the carina, where there are two
teeth ; thus there are five in all. The cup-shaped basis of the shell
is pinkish ; the epidermis, which remains upon the hasal half of the
compartments, bright yellow.
Air. Darwin (i. c. p. 311) mentions some remarkable variations in
the external armature of this species, but none which at all resemble
the specimen now described. In the very closely sALeá. A . sqoongites
the calcareous projections of the shell are often of considerable
size, yet not nearly so large as the teeth in the specimen from
Albany Island, and much more numerous and irregularly distributed,
l a the specimen of A. sulcata from Sydney, with narrow-linear
carino-lateral compartments, the walls of the shell are externally
smooth.
* Monograph of Cirripedia, Balanid®, p. 310 (1854).
P Y C NOGON I D A .
B Z
E. J. MIEBS.
1. Achelia lævis, var. australiensis. (P late XXXV. fig. A.)
Body and legs moderately robust, the body disciform, the leg-
bearing processes being closely approximated. Proboscis stout, subcylindrical,
tapering toward its distal extremity, slightly defiexed.
Alandibles rudimentary, 2-jointed, the terminal jo in t very small.
Palpi 8 -jointed?; ovigerous legs 10-jointed. Legs without spines,
but with a short, blunt, conical process at tho distal end of tho
fourth joint, and with two auxiliary claws beside the normal claw.
As Air. Hodge’s description of Achelia lævis (from Polperro, Cornwall)
is very insufficient, I append the following from the single
Australian example I have examined :—
The body is robust and disciform, with the leg-bearing processes
enlarging distally and closely approximated. The cephalothoracic
segment (viewed from above) is as long as the three following and
is elevated on its dorsal surface, which bears the rounded oculiferoua
tubercle ; the three following segments (in a dorsal view) short and
transverse ; the first the shortest, almost transversely linear. The
proboscis is about as long as the body without the abdomen, obliquely
defiexed, and is of a narfow ovoid shape, tapering to the
distal extremity. The abdomen about as long as the three preceding
segments of the body, and very slender. The mandibles are rudimentary,
2-joiuted, the terminal joint about half the length of
the preceding. The palpi are apparently 8-jointed (on one side
evidently broken) ; the second and fourth joints subequal and rather
long ; the first and third and the four last very short. The ovigerous
legs 10-jointed ; the first joint very short, the second and third
longer and snhequal, the fourth and fifth yet longer and of about
equal length, the sixth to ninth very short, and tho terminal joint
minute. The first to third joints of the legs are short, the second a
very little longer than the first or th ird ; the fourth, fifth, aud sixth
joints longer and of about equal length ; the fourth joint somewhat
more dilated than either of the following, and with a slight blunt
process at the distal end of its upper margin ; the upper surface of
the fifth and sixth joints is slightly uneven, but can scarcely be
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