File:The animals and man; an elementary textbook of zoology and human physiology (1911) (14598111340).jpg

Identifier: animansmanelemen00kell (find matches)
Title: The animans and man; an elementary textbook of zoology and human physiology
Year: 1911 (1910s)
Authors: Kellogg, Vernon L. (Vernon Lyman), 1867-1937 McCracken, Mary Isabel
Subjects: Zoology Physiology
Publisher: New York, H. Holt and company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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er of fine thread-like or hair-like protoplasmicprolongations called flagella or cilia. Many of the familiarProtozoa of the fresh-water ponds always have two whiplash-like flagella projecting from one end of the body. By meansof the lashing of these flagella in the water the tiny creatureswims about. Others have many hundreds of fine shortcilia scattered, sometimes in regular rows, over the body-surface. The Protozoan swims by the vibration of thesecilia in the water. There is no stagnant pool, no water standing exposed in *In some Protozoa a number of similar cells temporarily unite to forma colony, but each cell may still be regarded as an individual animal. 118 THE SIMPLEST, OR ONE-CELLED ANIMALS 119 watering-trough or barrel which does not contain thousandsof individuals of the one-celled animals. And in any suchstagnant water there may always be found several or manydifferent kinds or species. A drop of this water examinedwith the compound microscope will prove to be a tiny world
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FIG. 46. Sun animalcule, a fresh-water Protozoan with a siliceous skeletonand long thread-like protoplasmic prolongations. (From life.) (all an ocean) with most of its animals and plants one-celledin structure. A few many-celled animals will be found in itpreying on the one-celled ones. There are sudden andviolent deaths here, and births (by fission of the parent) andactive locomotion and food-getting and growth and all of thebusinesses and functions of life which we are accustomedto see in the more familiar world of larger animals. 120 THE ANIMALS AND MAN Marine Protozoa.—One usually thinks of the ocean asthe home of the whales and the seals and the sea-lions, andof the countless fishes, the cod, and the herring, and themackerel. Those who have been on the seashore willrecall the sea-urchins and starfishes and the sea-anemoneswhich live in the tide-pools. On the beach there are theinnumerable shells, too, each representing an animal whichhas lived in the ocean. But more abundant th

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