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Updated: June 28, 2025
The larvae of insects, whether adapted to the most diverse and active habits, or quite inactive, being fed by their parents or placed in the midst of proper nutriment, yet nearly all pass through a similar worm-like stage of development; but in some few cases, as in that of Aphis, if we look to the admirable drawings by Professor Huxley of the development of this insect, we see no trace of the vermiform stage.
John showed us the little worm-like things before they were put in the pan, and he told us they came "all the way Canton." He offered us, by way of refreshment, his very last drop of liquor from a bottle that was labelled, "Burnett's Fine Old Tom," which he kept, I suppose, for his private consumption.
The egg has no nutritive cells; the formation of the primitive band, usually the first indication of the germ, is retarded till the second larval stage is attained; and the embryonal membrane is not homologous with the so-called "amnion" of other insects, but may possibly be compared with the skin developed on the upper side of the low, worm-like acarian, Pentastomum, and the "larval skin" of the embryos of many low Crustacea.
After attaining this form, its small abdomen begins to enlarge until it assumes a globular form, and the mass of mites look like little beads. Mr. Newport was unable to discover the male, and thought that this mite was parthenogenous. It will be seen that the adult Demodex retains the elongated, worm-like appearance of the larva of the higher mites, such as Typhlodromus.
Though in external form they resemble each other, the one is a worm-like Radiate, the other is a worm-like Articulate, each having the structure of its own type; so that they do not even belong to the same great division of the animal kingdom, much less to the same class.
Another group of worm-like or snaky creatures common on a coral-reef are the sea-cucumbers or beche-de-mer. In my experience the most singular branch of the family is at once the longest and thinnest, for it resembles a snake so closely that at first sight the observer subconsciously assumes an attitude of hostility. There seem to be two varieties of the species.
There were dozens of cells in his impure culture, but only one seemed unfamiliar. It was a long, worm-like thing, sharpened at both ends, with the three separate nuclei that were typical of Martian life forms. Nearby were a host of little rodlike squiggles just too small to see clearly. Martian life! No Martian bug had ever proved harmful to men.
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