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Updated: June 25, 2025
"The rhizocephalous crustaceans do not feed like other animals by their mouths, for they are destitute of an alimentary canal, but they live by absorbing through root-like processes the juices of the animals on which they are parasitic."
Our hero was soon to learn that bragging about one's ancestors and connections was not a weakness confined alone to Aunt Sheen, for many other fish possessed it, and this seems strange when they openly declared that they sometimes devoured their younger and weaker relations. The Hermit-Crab belonged to a large family called the Crustaceans.
You exclaim, "It is a Lobster!" A lobster truly; but saw you ever a lobster with such presence before? Does he resemble the poor bewildered crustaceans you have seen bunched together at a fish-stall? Bears he any likeness to the innocent-looking edibles you have seen lying on a dish, by boiling turned, like the morn, from black to red? Those ghost-like Prawns are near relatives of the giant.
It possesses also large cheek-pouches, similar in their use to those of monkeys. It is thus enabled to stow away the creatures it catches on its aquatic excursions, and to keep them there till it returns to the shore to dine. It feeds principally on fish, crustaceans, and aquatic insects.
Here we see longitudinal and transverse integration going on simultaneously; and in the highest crustaceans they are both carried still further. The Vertebrata exhibit this transverse integration in the development of the generative system.
Burmeister, in his work on the organisation of trilobites, supposes that they swam at the surface of the water in the open sea and near coasts, feeding on smaller marine animals, and to have had the power of rolling themselves into a ball as a defence against injury. He was also of opinion that they underwent various transformations analogous to those of living crustaceans.
Then it splits across the back. After much wriggling, the Shrimp appears in a new soft skin. While the skin is still soft the Shrimp grows very quickly. Crustaceans have a funny way of growing, have they not? Instead of growing evenly, little by little, they grow by "fits and starts," a great deal in a few hours and then not at all.
Their harder parts the shells of mollusks, the white framework of corals, the carapaces of crabs and other crustaceans, the shells of sea urchins, the bones and teeth of fishes are gradually buried within the accumulating sheets of sediment, either whole or, far more often, broken into fragments by the waves.
Most physiologists believe that the bones of the skull are homologous with that is correspond in number and in relative connexion with the elemental parts of a certain number of vertebræ. The anterior and posterior limbs in each member of the vertebrate and articulate classes are plainly homologous. We see the same law in comparing the wonderfully complex jaws and legs in crustaceans.
Now these gills can only act when under water, and so the squillae dies as soon as he is removed from that protecting element. For the same reason they cannot be kept long, nor travel far, much to the regret of those who like them and live at some distance from the sea. There are other crustaceans, next-door neighbors of the squilla, whose gills are still more simplified.
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