FRESH-WATER SHRIMP.
TADPOLES AND YOUNG FROG.
The fresh-water Shrimp may generally be found in plenty in any running stream. Its appearance and habits very much resemble the Sandhopper, a little creature that every one must have seen who has walked on a sandy sea-shore. Like the cray-fish, this little creature carries its eggs about until they are hatched. It is a carnivorous animal, and is one of the numerous scavengers of the water, without whose help every stream would soon become putrid and loathsome.
WOODLOUSE, ARMADILLO, AND PILL MILLEPEDE.
Certain species of crustacea inhabit the land; two of which are well known under the titles of Woodlouse and Armadillo. They belong to the class of crustaceans called “Isopod,” or equal-footed, because the legs are all of the same nature; whereas, in the other crustacean, some legs are used for walking, and others are turned into claws, &c. The woodlouse is to be found in myriads under the scaly bark of trees, under stones, and, in fact, in almost every crevice. It feeds mostly on decayed vegetable matters, but also eats animal substances, and vegetables that are not decayed. Some gardeners hold the woodlouse in great horror, and say that nothing is so hard or so bitter that a woodlouse will not eat it. If the bark is removed from an ancient willow tree, any number of these creatures may be discovered, in every stage of existence, scuttling about in great fear at the unwelcome light, and sticking close to the wood in hopes that they may not be seen. Dried coats of the woodlouse may be also seen, empty and bleached to an ivory whiteness. They are night-feeders; and, although they can run fast enough if disturbed, walk very deliberately when only employed in feeding.
The Armadillo-woodlouse is very curious, and easily recognised from its habit of rolling itself into a round ball when alarmed, just like the quadruped armadillo. Its habits are much the same as those of the common woodlouse. Formerly the armadillo was used in medicine, being swallowed as a pill in its rolled-up state. I have seen a drawer half full of these creatures, all dry and rolled up, ready to be swallowed.
On the preceding cut are two armadillo-like animals, much resembling each other, but belonging to different orders. Fig. a is the Woodlouse; b, the Pill Millepede, walking; c, the same rolled up; d is the true Armadillo, walking; and e, the same creature rolled up.