. Animal biology. Zoology; Biology. 70 PROTOZOA into a great number of very small hexagonal areas. From the center of each of these areas arises a cihum. Just below the pelhcle is the clear and relatively firm ectoplasm, often called the cortex, which contains a great many spindle-shaped cavities placed with their longer axes at right angles to the surface. These cavities are filled with a semifluid substance and are known as trichocysts. They open to the outside along the lines which bound the hexagonal areas. The ciUa are described as having an axial thread continuous with the cortex and a c
. Animal biology. Zoology; Biology. 70 PROTOZOA into a great number of very small hexagonal areas. From the center of each of these areas arises a cihum. Just below the pelhcle is the clear and relatively firm ectoplasm, often called the cortex, which contains a great many spindle-shaped cavities placed with their longer axes at right angles to the surface. These cavities are filled with a semifluid substance and are known as trichocysts. They open to the outside along the lines which bound the hexagonal areas. The ciUa are described as having an axial thread continuous with the cortex and a covering continuous with Ectoplasm and trichocysts EndopJasm Moicronucleus Food vacuole Pellicle. Cilia Contractile vacuole Oral groove \ \—Micronucleus r g—Mouth Gullet Contractile vacuole Fig. 22.—Paramecnnn caudatum Ehrenberg. X 400. the pellicle. The endoplasm contains food vacuoles, two contractile vacu- oles, and numerous granular masses various in size, shape, and character. The contractile vacuoles, one at each end of the body, he between the ectoplasm and endoplasm and are made up of a central space sur- rounded by a system of radiating canals, from 6 to 10 in number. These radiating canals end blindly in the cytoplasm at the outer end and at the inner end empty into the central space, which in turn opens to the outside. After the central space becomes empty, the canals discharge their con- tents into it and then again gradually fill while the central space is being. 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 Wolcott, Robert Henry, 1868-1934; University of Nebraska (Lincoln campus). Dept. of Zoology. New York ; London : McGraw-Hill Book Company, Inc.
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