. The biology of the protozoa. Protozoa; Protozoa. 452 BIOLOGY OF THE PROTOZOA division of the nucleus, without complete cell division, becomes binucleated or multinucleated. In a similar matter other cham- bers are added to those already formed until complicated aggre- gates measuring 3 or more inches in diameter in some cases result (Nummulites, etc.). These, however, are to be regarded as single individuals of syncytial nature illustrating growth and differentia- tion rather than reproduction. With the formation of a brood of reproductive bodies each of which produces a similar multinucleat
. The biology of the protozoa. Protozoa; Protozoa. 452 BIOLOGY OF THE PROTOZOA division of the nucleus, without complete cell division, becomes binucleated or multinucleated. In a similar matter other cham- bers are added to those already formed until complicated aggre- gates measuring 3 or more inches in diameter in some cases result (Nummulites, etc.). These, however, are to be regarded as single individuals of syncytial nature illustrating growth and differentia- tion rather than reproduction. With the formation of a brood of reproductive bodies each of which produces a similar multinucleated individual we can speak of asexual reproduction in a strict sense. Thus in Polystomellina crispa (Fig. 123, p. 235), after multiplication of the nuclei, the latter give rise by fragmentation to a large number of minute nuclei having the significance of chromidia. The plasm forms islands about each of these minute nuclei, or groups of them, and is then broken up into as many minute cells as there are 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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