culiar structure, the rami
being equal in length and strength. The two rudimentary rami on each
side are nearly straight, and seem incapable of movement; they project
out behind the normal rami, and closely resemble in general appearance,
the two caudal appendages; hence this cirripede, at first sight, appears
to be six-tailed.

_Pedicels of Cirri._--The pedicel of the first pair is very short; that
of the second is the longest; those of the posterior cirri decreasing in
length. Upper segments short; lower segments in the second, third and
fourth cirri, irregularly and rather thickly clothed with bristles, but
in the fifth and sixth cirri, there is a regular double row of main
spines, with some minute intermediate ones: hence there is a difference,
both in the rami and in the pedicels, between the fourth cirrus and the
fifth and sixth, and this is a unique case. On the dorsal surface of the
pedicel of the second cirrus, there is a tuft of much feathered fine
spines.

_Caudal Appendages._--Each consists of eight much tapering, very thin
segments, furnished with a few short simple spines round their upper
margins, and with a longer tuft on the terminal short segment; basal
segments twice as thick as the middle ones. In length, these caudal
appendages equal the pedicels of the sixth pair of cirri, and are a
very little shorter than the rudimentary rami of these same cirri.

_General Remarks._--Having examined this species first in the genus, I
fully anticipated that the very remarkable character of the inner rami
of the fifth and sixth cirri being rudimentary, and serving the same
function (if any) with the caudal appendages, would have been generic;
but this is not the case, for _Alepas cornuta_ cannot be separated from
_A. minuta_ without violating a clear natural affinity.

4. ALEPAS TUBULOSA.

Quoy et Gaimard. Voyage de l'Astrolabe, Pl. xciii, fig. 5, 1834.

_A. apertura parva prominente et tubulosa: scutis et prominentiis
secundum marginem carinalem, nullis._

Orifice small, tubular, protuberant; capitulum without horny scuta or
projections along the carinal margin.

Animal unknown.

New Zealand, Tolaga Bay. Attached to a living Palinurus.

I have given the above brief character from the plate, and imperfect
description in the voyage of the Astrolabe. The small and distinctly
tubular orifice, and the smooth carinated edge of the globose capitulum,
appear sufficiently to distinguish this species f