. The Protozoa. Protozoa. SEXUAL PHENOMENA IX THE PROTOZOA 227 Under certain conditions some of the adult cells become separated from the colony and pass into a resting state, during which they divide into eight biflagellated microgametes, and these, as soon as liberated, conjugate in pairs (Hieronymous, Rostafinski, '75). There is no size differentiation between the conjugating microgametes. Nor is there. Fig. 125.— Gonium pectorals O. F. M., in division. The third cleavage results in two layers of four cells (z, k, o). The flattening occurs in the 12-16-cell stage (g, m,p). in the somewhat b
. The Protozoa. Protozoa. SEXUAL PHENOMENA IX THE PROTOZOA 227 Under certain conditions some of the adult cells become separated from the colony and pass into a resting state, during which they divide into eight biflagellated microgametes, and these, as soon as liberated, conjugate in pairs (Hieronymous, Rostafinski, '75). There is no size differentiation between the conjugating microgametes. Nor is there. Fig. 125.— Gonium pectorals O. F. M., in division. The third cleavage results in two layers of four cells (z, k, o). The flattening occurs in the 12-16-cell stage (g, m,p). in the somewhat better-known form, Pandorina morum. In the latter, which is also a sixteen-cell colony, after a certain number of asexual generations, a generation appears in which each of the sixteen cells divides, not into sixteen parts for a new colony, but as in Gonium into eight gametes, which ultimately become free, conjugate, and pass into a resting zygote condition. After a longer or shorter period, either the cyst bursts, and a naked individual emerges, which by division. 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, The Macmillan company; London, Mamcillan & co. , ltd.
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