Our Common Insects a Popular Account of the Insects of Our Fields Forests Ga

Cover Our Common Insects a Popular Account of the Insects of Our Fields Forests Ga
Our Common Insects a Popular Account of the Insects of Our Fields Forests Ga
A S Alpheus Spring Packard
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In the Demodex we see a tendency of the mite to assume under peculiar circumstances an elongated, worm-like form. The mouth-parts are aborted (thouirh from what we know of the embryology of other mites, they probably are indicated early in embry onic life), while the eight legs are not jointed, and form simple tu bercles. In the Tardigrades, a long step lower, we have un join ted fleshy I legs armed with from two to four | claws, but the mouth-parts are essentially mite in character. A 191. Nau...plius. Decided worm feature is the fact that they are hermaphrodites, each individual having ovaries and spermaries, as is the case with many worms. When we come to the singular creatures of which Pentastoma and Linguatula are the type, we have the most striking approx imation to the worms in external form, but these are induced evidently by their parasitic mode of life. They lose the rudi mentary jointed limbs which some (Linguatula especially) have well marked in the embryo, and from being oval, rudely mite- like in form, they elongate, and only the claws or simple curved hooks, like those of young tape worms, remain to indicate the original presence of true jointed legs.

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