. Animal forms; a second book of zoology. Zoology. 12 ANIMAL FORMS 14. The Amoeba.—Among the simplest one-celled ani- mals living in the ooze at the bottom of nearly every fresh- water stream or pond is the Amoeba (Fig. 5, A), whose body is barely visible to the unaided eye. Under the microscope. Fig. 5.—A, the Amoeba, highly magnified, showing c. v., pulsating vacuole; /, food particle ; n, nucleus. The arrows show the direction of movement. B, shape of same individual 30 seconds later. C, an amceba-like animal {Difflugia) partially enclosed in a shell. D, an Amoeba in the process of division
. Animal forms; a second book of zoology. Zoology. 12 ANIMAL FORMS 14. The Amoeba.—Among the simplest one-celled ani- mals living in the ooze at the bottom of nearly every fresh- water stream or pond is the Amoeba (Fig. 5, A), whose body is barely visible to the unaided eye. Under the microscope. Fig. 5.—A, the Amoeba, highly magnified, showing c. v., pulsating vacuole; /, food particle ; n, nucleus. The arrows show the direction of movement. B, shape of same individual 30 seconds later. C, an amceba-like animal {Difflugia) partially enclosed in a shell. D, an Amoeba in the process of division. E, Gromia, another shelled protozoan (after Schulze). it is seen to consist of an irregular, jelly-like mass of proto- plasm totally destitute of a cell wall. Unlike those animals with which we are familiar, the body constantly changes its 'shape. »A rounded bud-like projection will be seen to appear on one side of the body and the protoplasm of adjacent regions flows into it, thereby increasing its extent. Similar projections at the opposite end of the cell are withdrawn, and their substance may flow into the newly formed lobe, which gradually swells in size and pushes forward. Thus, by constantly advancing the front part of the body and. 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 Jordan, David Starr, 1851-1931; Heath, Harold, 1868- [from old catalog] joint author. New York, D. Appleton and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
