. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. ORGANELLES 29 divisible into an outer and inner zone, the ectoplasm and endo- plasm, respectively (Fig. 1). There is no fundamental difference between these two layers of protoplasm, merely a difference in density. The ectoplasm is the less fluid and comparatively clear, while the endoplasm is more fluid and somewhat granular. The clearness of the differentiation between ectoplasm and endo- plasm is sometimes useful in distinguishing species of protozoans, especially amebse. The ectoplasm differs from t
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. ORGANELLES 29 divisible into an outer and inner zone, the ectoplasm and endo- plasm, respectively (Fig. 1). There is no fundamental difference between these two layers of protoplasm, merely a difference in density. The ectoplasm is the less fluid and comparatively clear, while the endoplasm is more fluid and somewhat granular. The clearness of the differentiation between ectoplasm and endo- plasm is sometimes useful in distinguishing species of protozoans, especially amebse. The ectoplasm differs from the endoplasm. Fig. 2. Types of organs of locomotion in Protozoa; A, Amoeba with pseudo- podia; J5, a heliozoan with " axopodia "; C, Bodo with free flagella; D, Trypanosoma with fiagellum attached to undulating membrane; E, Choanofiagellate with flagel- lum and "collar"; F, Pleuronema with cilia and undulating membrane formed of fused cilia; G, modes of insertion of cilia; H, Aspidisca with cirri. (Figs. F to H from Calkins.) in function as well as in appearance. The ectoplasm may be likened to the body wall and appendages of higher animals while the endoplasm may be compared with the viscera or inter- nal organs. The endoplasm digests food and has the power of secretion and excretion, while the ectoplasm produces the vari- ous organelles for locomotion, food getting, oxygen absorption and special senses. The term " organelle " is used in place of " organ " for structures which are only parts of a single cell. Organelles. — The organelles contained in a protozoan's body may be many and varied. Those connected with movement or locomotion differ in different groups and form the chief charac- teristic on which the usual classification into Sarcodina, Flagellata,. 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 n
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