. Biology. Biology. FLAGELLATED PROTOZOA 59 limited to a certain number of cells, and this number always reappears upon reproduction so that the multicellular individual is much more specific in nature, as in Gonium pectorale where the individual always consists of 16 cells (Fig. 25). These colony forms are of peculiar interest in that they have many features in common with the higher animals and plants,. FIG. 25.—Gonium pectorale, a colony of flagellated protozoa consisting of sixteen cells arranged in a flat plate, three on a side and four in the center. Each cell carries two flagella. Photo
. Biology. Biology. FLAGELLATED PROTOZOA 59 limited to a certain number of cells, and this number always reappears upon reproduction so that the multicellular individual is much more specific in nature, as in Gonium pectorale where the individual always consists of 16 cells (Fig. 25). These colony forms are of peculiar interest in that they have many features in common with the higher animals and plants,. FIG. 25.—Gonium pectorale, a colony of flagellated protozoa consisting of sixteen cells arranged in a flat plate, three on a side and four in the center. Each cell carries two flagella. Photograph from a preparation. but the cells are not differentiated for the performance of differ- ent functions, each one acting for itself rather than for the ag- gregate as a wrhole. They represent, therefore, a phase in complexity of form and function intermediate between the uni- cellular organisms (protozoa, protophyta) and the multicellular (metazoa and metaphyta).. 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. New York, H. Holt and company
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