. The biology of the protozoa. Protozoa; Protozoa. 20 BIOLOGY OF THE PROTOZOA conceptions of a cell. In perhaps the majority of the Protozoa the fundamental vital activities are performed, as in the simpler Ameba or simple flagellates, by the protoplasm as a whole and without other visible specializations than nucleus and cell body. In other forms, Mac. Fig. 2.—Diplodinium ecaudatum, a parasitic ciliate in cattle. A, anal canal and defecatory vacuole; C. V., one of the two contractile vacuoles; M, motorium with fiber to circumpharyngeal ring; Mac., macro nucleus; Mic, micronucleu
. The biology of the protozoa. Protozoa; Protozoa. 20 BIOLOGY OF THE PROTOZOA conceptions of a cell. In perhaps the majority of the Protozoa the fundamental vital activities are performed, as in the simpler Ameba or simple flagellates, by the protoplasm as a whole and without other visible specializations than nucleus and cell body. In other forms, Mac. Fig. 2.—Diplodinium ecaudatum, a parasitic ciliate in cattle. A, anal canal and defecatory vacuole; C. V., one of the two contractile vacuoles; M, motorium with fiber to circumpharyngeal ring; Mac., macro nucleus; Mic, micronucleus; S, skeletal layer. (After Sharp.) however, intracellular differentiations lead to intracellular division of labor which in some types becomes as complicated as are many of the organisms belonging to the Metazoa. Thus Diplodinium ecaudatum, one of the Infusoria, according to Sharp (1914), has intracellular differentiations of extraordinary complexity (Fig. 2).. 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 Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
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