. The biology of the Protozoa. Protozoa; Protozoa. 226 BIOLOGY OF THE PROTOZOA of the presence or absence of a micronucleus, a fact indicating a change in organization with advancing age (Fig. 108, 5). The fate of the motorium and of the coordinating fibrils at divi- sion is still unknown, but the prediction may be made that, like other kinetic elements, it also divides during the reorganization. Fig. 108.— Uroyiychia transfuga, merotomy and regeneration. 1, cell immediately after division, cut as indicated; 2, fragment ^ of 1, three days after the operation; no regeneration; 3, cell cut five
. The biology of the Protozoa. Protozoa; Protozoa. 226 BIOLOGY OF THE PROTOZOA of the presence or absence of a micronucleus, a fact indicating a change in organization with advancing age (Fig. 108, 5). The fate of the motorium and of the coordinating fibrils at divi- sion is still unknown, but the prediction may be made that, like other kinetic elements, it also divides during the reorganization. Fig. 108.— Uroyiychia transfuga, merotomy and regeneration. 1, cell immediately after division, cut as indicated; 2, fragment ^ of 1, three days after the operation; no regeneration; 3, cell cut five hours after division; 4, fragment A of 3, three days after operation, no regeneration; 5, cell cut at beginning of division as indicated into fragments A, B, and C; A', B', C", fragments A, B and C, twenty-four hours after the operation; fragment A regenerated into a normal but emicronucleate individual (A'); B, C divided in the original di\-ision plane forming a normal individual (C') and a minute but normal individual {B'). (After Calkins.) process. It is a significant fact that the peristome and the peri- stomial organs appear first in the more s})ecialized anterior half of the ciliate cell, and from this position gradually shift to the region immediately posterior to the division zone (Fig. 105). In VorticeUa according to Biitschli (1S88) after Fabre, the peristome and adoral zones are reversed in the daughter 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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Keywords: ., bookauthorcalkinsgaryngarynatha, bookcentury1900, bookdecade1920
