. Animal biology; Human biology. Parts II & III of First course in biology. Biology. PROTOZOA II PS:. EC. EN FIG. 10.—AMEBA. ci>, contractile vacuole; ec, ectoplasm; en, endoplasm; «, nucleus; ps, pseudopod; ps', pseudopod forming; ectoplasm pro- trudes and endoplasm flows into it. Form and Structure. — The ameba (also spelled amoeba) looks so much like a clear drop of jelly that a beginner cannot be certain that he has found one until it moves. It is a speck of protoplasm (Fig. 9), with a clear outer layer, the ectoplasm; and a granular, internal part, the endoplasm. Is there a dis- ti
. Animal biology; Human biology. Parts II & III of First course in biology. Biology. PROTOZOA II PS:. EC. EN FIG. 10.—AMEBA. ci>, contractile vacuole; ec, ectoplasm; en, endoplasm; «, nucleus; ps, pseudopod; ps', pseudopod forming; ectoplasm pro- trudes and endoplasm flows into it. Form and Structure. — The ameba (also spelled amoeba) looks so much like a clear drop of jelly that a beginner cannot be certain that he has found one until it moves. It is a speck of protoplasm (Fig. 9), with a clear outer layer, the ectoplasm; and a granular, internal part, the endoplasm. Is there a dis- tinct line between them ? (Fig. 10.) Note the central portion and the slender prolonga- tions or pseudopods (Greek, false feet). Does the endoplasm extend into the pseudo- pods ? (Fig. 10.) Are the pseudopods arranged with any regularity ? Sometimes it is possible to see a denser appearing por- tion, called the nucleus ; also a clear space, the contractile vacuole (Fig. 10). Movements. - - Sometimes while the pseudopods are be- ing extended and contracted, the central portion remains in the same place (this is mo- tioii). Usually only one pseudo- pod is extended, and the body flows into it; this is locomotion (Fig. 11). There is a new foot made for each step. Feeding. — If the ameba crawls near a food particle, the pseudopod is pressed against it, or a depression occurs (Fig. 12), and the particle is soon embedded in the endoplasm. Often a clear space called a food vacuole is noticed around the food particle. This is the water that is taken in with. 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, The Macmillan Co.
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