. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 268 ZOOLOGY nautilus and pearly nautilus, the latter made famous by our poet Holmes, also belong to this Octopus. Habitat of the MoUusks. — Mollusks are found in almost all parts of the earth and sea. They are more abundant in temperate localities than elsewhere, but are found in tropical and arctic countries. They are found in all depths of water, but by far the greatest number of species live in shallow water near the shore. The cephalopods live near the surface of the ocean, wher
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 268 ZOOLOGY nautilus and pearly nautilus, the latter made famous by our poet Holmes, also belong to this Octopus. Habitat of the MoUusks. — Mollusks are found in almost all parts of the earth and sea. They are more abundant in temperate localities than elsewhere, but are found in tropical and arctic countries. They are found in all depths of water, but by far the greatest number of species live in shallow water near the shore. The cephalopods live near the surface of the ocean, where they prey upon small fish. The food supply evidently determines to a large extent where the animal shall live. Some mollusks are scavengers, others feed on living plants. We have found in the forms of Mollusc a studied that almost all mollusks live in the water. There is one great group which forms, a general exception to this, certain of the snails and slugs called pulmonates. But even these animals are found in damp localities, and at the approach of drought they become inactive, remaining within the shell. The European snail {Helix pomatia), imported to this country as a table delicacy, exists for months by plugging up the aperture to the shell with a mass of slimy material which later hardens, thus protecting the soft body within. Economic Importance. — In general the mollusks are of much economic importance. The bivalves especially form an important. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hunter, George William, 1873-1948. New York, American book company
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