Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 364 ELEMENTARY BIOLOGY 409. Flight. Beginning with the ameba, that withdraws its ' false feet' from a point of disturbance, and reaching to man himself, all animals that are not confined or attached protect themselves by some form of flight or escape. With this fact is associated a wonderful series of organs of locomotion, from the false feet and cilia of the protozoa, the water feet of the starfish, the flapping shell movements of the scallop, the wriggling of
Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 364 ELEMENTARY BIOLOGY 409. Flight. Beginning with the ameba, that withdraws its ' false feet' from a point of disturbance, and reaching to man himself, all animals that are not confined or attached protect themselves by some form of flight or escape. With this fact is associated a wonderful series of organs of locomotion, from the false feet and cilia of the protozoa, the water feet of the starfish, the flapping shell movements of the scallop, the wriggling of P'iG. 182. The hermit crab These crabs make themselves at home in the cast-off shells of whelks and snails. (From photograph by New York Zoological Society) worms, and the legs and wings of insects, up to the various kinds of legs and wings and fins of the backboned animals. It is impossible to say that organs of locomotion are pri- marily related to protection or that they are primarily related to food-getting. At the very lowest levels of life, among the protozoa, we find the same structures and activities serving organisms in both relations. Thus, the paramecium, moving about by means of cilia, also gets food particles into the inte- rior of the protoplasm by means of cilia. And farther up we find feeding organs and locomotive organs differentiated from the same structures (see Fig. 183).
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