. The biology of the protozoa. Protozoa; Protozoa. GENERAL PHYSIOLOGY 201 Specific structural adaptations, useful in methods of food-getting, are characteristic. Haustoria-like processes, derived from the epimerites of gregarines, in some cases extend deeply in the tissue cell {Stylorhynchus longicollis, Echinomera hispida, Pyxinia moebiuszi, etc., Fig. 103). The coccidian Caryotropha mesnili, according to Siedlecki, shows a significant relation between the nucleus of the host cell and that of the parasite. This organism is a parasite in the spermatozoa of the annelid Polymnia nebvlosa where t
. The biology of the protozoa. Protozoa; Protozoa. GENERAL PHYSIOLOGY 201 Specific structural adaptations, useful in methods of food-getting, are characteristic. Haustoria-like processes, derived from the epimerites of gregarines, in some cases extend deeply in the tissue cell {Stylorhynchus longicollis, Echinomera hispida, Pyxinia moebiuszi, etc., Fig. 103). The coccidian Caryotropha mesnili, according to Siedlecki, shows a significant relation between the nucleus of the host cell and that of the parasite. This organism is a parasite in the spermatozoa of the annelid Polymnia nebvlosa where the sperm cells are aggregated in bundles in the characteristic annelid fashion, usually about a feeding mass or blastophore. The parasite gets into such a cell as an agamete or sporozoite, one only of the bundle,. Fig. 103.—Food-getting adaptations of Sporozoa. 1, Pyxinia moebiuszi with epi- merite deeply insunk in the epithelial host cell (after Leger and Dubosq); 2, Caryo- tropha mesnili with an intracellular canal from the nucleus of the host cell (ti). (After Siedlecki.) as a rule, being infected, and as it grows the nucleus of the cell is displaced to one side and the cell loses its characteristic structure, becoming hypertrophied and distorted (Fig. 103, 2). Not only the infected cell but all the other cells of the spermatogonia bundle are affected, and none of them continues the normal development, but they become arranged like epithelial cells about the hypertrophied infected cell. The specific effect of the young Caryotropha on the infected cell consists not only of the enlargement of that cell, but of a definite feeding mechanism by which the parasite is supplied with food. That the nucleus is a center of constructive metabolic changes is well assured at the present day, and the conditions in these para-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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