. The transformations (or metamorphoses) of insects (Insecta, Myriapoda, Arachnida, and Crustacea) : being an adaptation, for English readers, of M. Émile Blanchard's "Metamorphoses, moeurs et instincts des insects;" and a compilation from the works of Newport, Charles Darwin, Spence Bate, Fritz Müller, Packard, Lubbock, Stainton, and others. anatifera. THE CIRRIPEDIA. 471 Lcpas, and their absence may be remarked in many are enclosed within the cavity formed by the white lookingshell, which, however, in Nature is occasionally coloured with a blueand even purple tint. When
. The transformations (or metamorphoses) of insects (Insecta, Myriapoda, Arachnida, and Crustacea) : being an adaptation, for English readers, of M. Émile Blanchard's "Metamorphoses, moeurs et instincts des insects;" and a compilation from the works of Newport, Charles Darwin, Spence Bate, Fritz Müller, Packard, Lubbock, Stainton, and others. anatifera. THE CIRRIPEDIA. 471 Lcpas, and their absence may be remarked in many are enclosed within the cavity formed by the white lookingshell, which, however, in Nature is occasionally coloured with a blueand even purple tint. When a sessile barnacle is examined—andthey can readily be kept in the aquarium—the cirri will be seen toproject through a trap-door apparatus called the operculum, orlid of the shell. The shell is made up of five or more side piecesconnected together with strips of membrane, which are often bril-liantly coloured. The pieces or valves are composed of carbonateof lime ; but in some kinds of Cirripcdia they are formed, like. AN ADULT SESSILE BARNACLE. {BalailUS.) the membranes, of chitine, and the whole is lined internally bythe sac which contains the living barnacle. When there is apeduncle one end forms the base of the shell, and the other is stuckfast to timber, stones, and sea-weeds, and the living animal is con-tinued down into this long neck-like attachment. This pedunclevaries in length in different kinds; it is usually flattened, but oftenquite cylindrical, and is composed of very strong, thick, trans-parent membrane, which covers a thick true skin, which is oftencoloured in long bands. The outside membrane is either nakedor clothed with minute pointed spines, or it is penetrated by scalesfrequently of carbonate of lime, which are more or less symme-trically placed over parts or the whole structure. The peduncleis lined within by three layers of muscles, longitudinal, transverse,and oblique, and they produce a gentle swaying movement, \\hichis beyond the will of the ani
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Keywords: ., bookcentury1800, bookdecade1870, booksubjec, booksubjectcrustacea
