onvince me that it is a true species, and I should
not be at all surprised at varieties, intermediate between it and the
common form, being hereafter found;--had a name not been already
attached to it, I should not have given one. In the monstrous variety
described, we see to what an extent the valves may vary. The _C.
Hunteri_ approaches nearest to the var. of _C. virgata_, called by Leach
_Cineras chelonophilus_, for in both, the top of the capitulum is
bluntly pointed and the terga are solid within; in the _Var.
chelonophilus_, the terga and carina are minute, whereas here, though
very narrow, they are much elongated. Certainly _C. chelonophilus_ has
almost as strong a claim to rank as a species as _C. Hunteri_; but, in
the former, by the aid of other varieties, the differences were almost
reduced to the peculiarities in the terga--the valves, the most subject
to variation. In _C. Hunteri_ we have other differences, and the form of
the terga is even still more peculiar. I have, therefore, provisionally
attached to it the specific name by which it is designated in the Museum
of the College of Surgeons. From having been long kept in spirits, all
aid from colour is lost.

_Genus_--ALEPAS. Pl. III.

ALEPAS. _Sander Rang._ Manuel des Mollusques, 1829.

ANATIFA. _Quoy_ et _Gaimard_. Voyage de l'Astrolabe, 1834.

TRITON. _Lesson._ Voyage de la Coquille, 1830.

CINERAS. _Lesson._ Secundum Sander Rang.

_Capitulum aut sine valvis, aut scutis corneis, paene abditis._

Capitulum without valves,[41] or with horny, almost hidden, scuta.

[41] Any one not attending to the characters derived from the
softer parts of the Balanidae and Lepadidae, might easily confound
with Alepas the genus Siphonicella (genus nov.), which,
undoubtedly, though having the external appearance of a
pedunculated cirripede, belongs to the Balaninae, and is closely
related to Coronula.

Filaments seated beneath the basal articulations of the first pair of
cirri; mandibles, with two or three teeth; maxillae notched, with the
lower part irregular, projecting; caudal appendages multi-articulate.

Attached to various living objects, fixed or floating.

_Capitulum_ either entirely destitute of valves, or with transparent
horny scuta, not containing any calcareous matter, and almost hidden in
membrane. These scuta are formed of a lower and a lateral lobe, placed
at above right angles to each other; they are added to by