. The biology of the Protozoa. Protozoa; Protozoa. Fig. 214.—Micronucleus of Paramecium caudalum in the prophases of the first meiotic division. A, Early stage in the formation of chromosomes; B, elongation of the nucleus prior to crescent formation; C, metaphase of the first division. Dehorne describes the entire chromatin aggregate as forming one highly convoluted chromo- some. (After Dehorne.) 7iasvtvm (Prandtl, 1906), Anojtlophrya hranchiarum (Collin, 1909) Oxytricha fallax (Gregory, 1923) and Urolephis mobilis. In these cases the nucleus swells to two or three times the usual diameter wit
. The biology of the Protozoa. Protozoa; Protozoa. Fig. 214.—Micronucleus of Paramecium caudalum in the prophases of the first meiotic division. A, Early stage in the formation of chromosomes; B, elongation of the nucleus prior to crescent formation; C, metaphase of the first division. Dehorne describes the entire chromatin aggregate as forming one highly convoluted chromo- some. (After Dehorne.) 7iasvtvm (Prandtl, 1906), Anojtlophrya hranchiarum (Collin, 1909) Oxytricha fallax (Gregory, 1923) and Urolephis mobilis. In these cases the nucleus swells to two or three times the usual diameter with the compact chromatin at one pole (Figs. 36, 227). In Urolep- tus mobilis there is an endobasal body within the nucleus; this divides, one-half passing to the periphery of the nucleus at the pole opposite the chromatin mass while the other half remains with the chromatin (Fig. 36). The distal centrosome is the focal point of the spindle fibers which spread out from it to the fragmenting chromatin mass and forms one pole of the mitotic spindle. In the transformation of the crescent type of prophase Maupas, Hertwig and Hamburger all agree that the spindle is formed by the. 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, New York, Lea & Febiger
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