n the under sides of her valves; (3d) an
hermaphrodite, with from one or two, up to five or six similar
short-lived males without mouth or stomach, attached to one particular
spot on each side of the orifice of the capitulum; and (4th)
hermaphrodites, with occasionally one, two, or three males, capable of
seizing and devouring their prey in the ordinary Cirripedial method,
attached to two different parts of the capitulum, in both cases being
protected by the closing of the scuta. As I am summing up the
singularity of the phenomena here presented, I will allude to the
marvellous assemblage of beings seen by me within the sack of an _Ibla
quadrivalvis_,--namely, an old and young male, both minute, worm-like,
destitute of a capitulum, with a great mouth, and rudimentary thorax and
limbs, attached to each other and to the hermaphrodite, which latter is
utterly different in appearance and structure; secondly, the four or
five, free, boat-shaped larvae, with their curious prehensile antennae,
two great compound eyes, no mouth, and six natatory legs; and lastly,
several hundreds of the larvae in their first stage of development,
globular, with horn-shaped projections on their carapaces, minute single
eyes, filiformed antennae, probosciformed mouths, and only three pair of
natatory legs; what diverse beings, with scarcely anything in common,
and yet all belonging to the same species!

[62] 'Annals of Natural History,' vol. ii, (2d series, 1848,) p.
153, Pl. vi. Mr. Dalrymple has published a very interesting paper
on the same subject in the 'Philosophical Transactions,' (p.
342,) 1849; and there is another Memoir by Mr. Gosse in the
'Annals of Natural History,' vol. vi, (1850,) p. 18.

_Genus_--POLLICIPES. Pl. VII.

POLLICIES. _Leach._ Journal de Physique, tom. lxxxv, Julius,
1817.[63]

LEPAS. _Linn._ Systema Naturae, 1767.

ANATIFA. _Brugiere._ Encyclop. Method. (des Vers), 1789.

MITELLA. _Oken._ Lehrbuch der Naturgeschichte, 1815.

RAMPHIDIONA. _Schumacher._ Essai d'un Nouveau Syst. &c., 1817
(ante Julium).

POLYLEPAS. _De Blainville._ Dict. des Sc. Nat., 1824.

CAPITULUM (secundum Klein). _J. E. Gray._ Annals of Philos., tom.
x, new series, Aug. 1825.

[63] This is one of the rare cases in which, after much
deliberation, and with the advice of several distinguished
naturalists, I have departed from the Rules of the British
Association; for it wil