. The Protozoa. Protozoa. SEXUAL PHENOMENA IN THE PROTOZOA 217 formation may take place in an isolated individual, and in this case, at least, reproduction cannot be dependent upon sexual union or conjugation, although it does not signify that conjugation is not nec- essary for the continued power of reproducing. Kent ('81), who has confirmed Cienkowsky's ('65) observations upon conjugation of Bodo augustatus, states that a difference exists in the number of spores that are formed in the fusion and in the solitary cysts, only four spores arising from the latter. A significant feature in the co
. The Protozoa. Protozoa. SEXUAL PHENOMENA IN THE PROTOZOA 217 formation may take place in an isolated individual, and in this case, at least, reproduction cannot be dependent upon sexual union or conjugation, although it does not signify that conjugation is not nec- essary for the continued power of reproducing. Kent ('81), who has confirmed Cienkowsky's ('65) observations upon conjugation of Bodo augustatus, states that a difference exists in the number of spores that are formed in the fusion and in the solitary cysts, only four spores arising from the latter. A significant feature in the conjugation of these forms is that the individuals lose their customary outline and become amoeboid prior to. Fig. 118. — Conjugation in Rhizopoda. [RHUMBLER.] A, B, C. Difflugia lobostoma Duj. D. Aggregated condition of Amceba verrucosa Ehr. fusion, thus showing that some change has taken place in the con- sistency of the plasm. A great number of observations have been made among the Rhi- zopoda upon so-called conjugation phenomena between similar indi- viduals, the process varying in complexity from simple contiguity to the more complicated fusion of cell-bodies. While many of the earlier observations probably dealt with division phases rather than with conjugating individuals, a possibility of error first pointed out by Claparede and Lachmann ('56), conjugation of shelled forms has been safely established through the observations of Butschli ('74), Jickeli ('84), Blockmann ('88), Penard ('90), Rhumbler ('98), and others, and of unshelled forms by Schultze {Gromia, '75), Holman ('86), and Kuhne ('64). The phenomena of cytotropy, or the mutual attraction of two or more cells, among the Sarcodina at least, if not in all forms, are probably closely connected with conjugation and may possibly be 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
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