rom _A. cornuta_. The
colour is stated to have been white with violet tints. Length, two
(French) lines.

ANELASMA. _Gen. Nov._ Pl. IV.

ALEPAS. _Loven._ Ofversigt of Kongl. Vetenskaps-Akad.
Foerdhandlinger: Forsta Argangen. Stockholm, 1844, p. 192,
Tab. 3.

_Capitulum sine valvis: apertura ampla: pedunculus fimbriatus,
sub-globosus, infossus._

Capitulum without valves; aperture large; peduncle fimbriated,
sub-globular, imbedded.

Cirri without spines; outer maxillae and palpi rudimentary, spineless;
mandibles minute, with several small teeth irregularly placed; maxillae
minute, with very minute irregularly scattered spines. No caudal
appendages.

* * * * *

I owe to the great kindness of Professor Steenstrup, an examination of
this very curious cirripede, well described and figured by Loven, who
considered it an Alepas. It lives parasitic, with its peduncle imbedded
in the skin of sharks, in the North Sea. According to the principles of
classification which I have followed, this cirripede cannot possibly
remain in Alepas, and must form a new genus; for some time, indeed, I
thought that a new family or sub-family ought to have been instituted
for its reception; but when I considered that its highly peculiar
characters are all negative, as the non-articular, non-spinose structure
of the cirri, and that no new or greatly modified functional organ is
present, I concluded that it might properly remain amongst the Lepadidae.
We shall, moreover, hereafter see that the male of Ibla, which, of
course, must remain in the same family with the female, is, in some
analogous respects, even more abnormal than Anelasma.

1. ANELASMA SQUALICOLA. Pl. IV, figs. 1-7.

ALEPAS SQUALICOLA. _Loven_, ut supra.

North Sea. Parasitic on Squalus.

_Capitulum_, destitute of valves; oval, much flattened; the double
membrane composing it, thin, highly flexible, coloured externally and
internally, by the underlying corium, of a blackish purple; aperture,
extremely large, extending from the upper end of the capitulum, to close
above the peduncle, gaping, and not protecting (in the dead condition)
the cirri and mouth.

The _Peduncle_ is about half as long as the capitulum, but, according to
Loven, this part varies in length; it is a little narrower than the
capitulum; colourless, from being imbedded in the shark's skin;
sub-globular; basal end almost hemispherical. Total lengt