Pedunculated cirripedes have two minute folds of skin, called by me the ovigerous frena, which serve, through the means of a sticky secretion, to retain the eggs until they are hatched within the sack.
Now I think no one will dispute that the ovigerous frena in the one family are strictly homologous with the branchiae of the other family; indeed, they graduate into each other.
The ovigerous fraena are largely developed, but serve, as previously stated, as branchiae, and not for their proper function of giving attachment to the ovigerous lamellae.
There are no ovigerous fraena, for the attachment of the lamellae; the ova being sufficiently well retained, as it would appear, by the well-closed shell.
The ova are united together by a most delicate tunic investing each egg; the ovigerous lamellae being thus formed, as in the Lepadidae.
The ovigerous lamella is single, and nearly corresponds, in size and shape (as would ensue from the manner of its formation) to the under side of the horny disc.
I have elsewhere stated my full belief that it is the ovigerous fraena which have been metamorphosed into the branchiae of the Balanidae.
The ovigerous frena of certain cirripedes, which have ceased to give attachment to the ova and are feebly developed, are nascent branchiae.
The ovigerous frena of certain cirripedes, which are only slightly developed and which have ceased to give attachment to the ova, are nascent branchiæ.
Now I think no one will dispute that the ovigerous frena in the one family are strictly homologous with the branchiæ of the other family; indeed, they graduate into each other.
Males in nearly all species appear once a year, when the last female generation, the ovigerous generation, is fertilized, and a few large ova are produced to carry on the continuity of the species over the winter.
As ovigerous fraena occur in the usual place in I.
The two ovigerous fraena are present in the usual position; the ovigerous lamellae either form several layers, in pairs, one under the other, or are united in a single large cup-formed sheet enclosing the whole animal.
I was unable to see any glands; and in another specimen, the ovigerous lamellae were not attached to the fraena; hence I conclude that the fraena are functionless in these three species.
The ovigerous lamellae, the edge projecting beyond the orifice of the capitulum.
The ovigerous fraena are small, constricted at the base, and square on the free margin, which is studded with minute glandular beads, borne on the finest footstalks.
Ova, spherical, 5/400ths of an inch in diameter, united as usual into two ovigerous lamellae.
These appendages have no relation to the generative system: the ovarian tubes, which surround the sack do not extend into them; nor do the ovigerous lamellae.
I call (after Steenstrup, and other authors) theovigerous Lamellae; they are united to two little folds of skin (Pl.
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