. 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. YOUNG ZOEA OF THE SAME PRAWN. Magnified 45 diameters (after F. Miiller). tail, and the stump-like rudiments of the feet of the middle bodyare formed. The appendages of the tail-piece sprout forth like other limbsfreely on the ventral surface. As the feet
. 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. YOUNG ZOEA OF THE SAME PRAWN. Magnified 45 diameters (after F. Miiller). tail, and the stump-like rudiments of the feet of the middle bodyare formed. The appendages of the tail-piece sprout forth like other limbsfreely on the ventral surface. As the feet of the middle body come into action simultaneouswith other profound changes, the zoea passes into the mysisform. The antennae cease to serve for locomotion, their place istaken by the thoracic feet, furnished with long hair-like spines(sets), and by the abdomen, which just before was laboriouslydragged along as a useless burden, but now, with its powerful 460 TRANSFORMATIONS OF INSECTS. muscles, jerks the animal through the water in a series of lively-jumps. The anterior antennae have lost the long setae, and by the. OLDER ZOEA OF THE SAME 45 diameters (after F. Miiller). side of the last or fourth joint, endowed with olfactory filaments(smellers), there appears a second branch, which is at first of asingle joint. The five new pairs of feet are biramose, the inner THE PENEUS. 461 branch short and simple, the outer one longer, annulated at theend, furnished with long setai, and kept, as in the genus Mysis, inconstant whirling motion. During this Alysis period the hearing organs are formed in thebase joint of the anterior antennae ; the inner branches of the firstthree pairs of feet are developed into chelae., or pincers, and the twohinder pairs into walking feet; palpi sprout from the mandibles,branchiae on the thorax, and swimming feet on the abdomen. Thespine on the labrum becomes reduced in size. In this way the animal gradually approaches the prawn form,in
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Keywords: ., bookcentury1800, bookdecade1870, booksubjec, booksubjectcrustacea
