connecting the true ovaria and the ovarian tubes in
the peduncle, pellets of orange-coloured cellular matter (_i. e._,
ovigerms) forming at short intervals little enlargements in the ducts,
and apparently travelling into the peduncle.

[19] I may here mention, that in all sessile Cirripedes, the
ovarian branching tubes lie between the calcareous or membranous
basis and the inner basal lining of the sack, and to a certain
height upwards round the sack: the true ovaria and the two ducts
occupy the same position as in the Lepadidae.

The structure here described is quite conformable with that which we
have seen in the larva; in the latter, two gut-formed masses of equal
thickness extended from the caeca of the stomach to within the future
peduncle, where the cement-ducts entered them, and where, after a short
period, they were seen to expand into a mass of ovarian tubes. In the
mature Cirripede, the cement-ducts can still be found united to the
ovarian tubes in the middle of peduncle; and the cause of the wide
separation of the true ovaria and ovarian tubes, can be simply accounted
for by the internal, almost complete intersection of the animal, which
takes place during the last metamorphosis.

The ova, when excluded, remain in the sack of the animal until the larvae
are hatched; they are very numerous, and generally form two concave,
nearly circular, leaves, which I have called after Steenstrup and other
authors, the _ovigerous lamellae_ (Pl. IV, fig. 2 _b_). These lamellae lie
low down on each side of the sack: in _Conchoderma virgata_, however,
there is often only a single lamella, forming a deeply concave cup: in
_C. aurita_ there are generally on each side four lamellae, one under the
other. The ova lie in a layer from two to four deep; and all are held
together by a most delicate transparent membrane, which separately
enfolds each ovum: this membrane is often thicker and stronger round the
margins of the lamellae, where they are united, in a peculiar manner,
presently to be described, to a fold of skin, on each side of the sack:
these two folds, I have called the _ovigerous fraena_ (Pl. IV, fig. 2
_f_).

M. Martin St. Ange, describes an orifice under the carina, by which he
supposes the ova to enter the sack; this, after repeated and most
careful examinations, I venture to affirm does not exist; on the
contrary, I have every reason to believe that the ova enter the sack in
the following curious man