Note 12 — Class—CRUSTACEA. Sub-Class—CIRRIPEDIA.

This distinguished naturalist has given his opinion in the ‘American Journal of Science,’ March, 1846, that “the pedicel of Anatifa corresponds to a pair of antennæ in the young;” although the peduncle or pedicel is undoubtedly thus terminated, even in mature individuals, I think it has been shown that it is the whole of the anterior part of the larva in front of the mouth, which is directly converted into the peduncle. Professor E. Forbes, in his Lectures, and Professor Steenstrup, in his ‘Untersuchungen über das vorkommen des Hermaphroditismus in der Natur,’ ch. v, have considered the peduncle as a pair of fused legs. Lovén has taken, judging from a single sentence, the same view of the homologies of the external parts as I have done; in his description of Alepas squalicola, (Ofversigt of Kongl. Vetens., &c., Stockholm, 1844, pp. 192-4), he uses the following words: “Capitis reliquæ partes, ut in Lepadibus semper, in pedunculum mutatæ et involucrum,” &c.; his involucrum is the same as the capitulum of this work.