. The biology of the protozoa. Protozoa; Protozoa. Fig. 5.—Paramecium caudatum, stages in encystment. The final product may be easily mistaken for a sand grain. (After Michelson, Arch. f. Protistenkunde, courtesy of G. Fischer.) . days division within the cyst and ex-cystation were observed. Michelson (1928), furthermore, has described encystment of Para- mecium caudatum under conditions of slow desiccation entailing loss of peristome, vacuoles and cilia. When fully dried the crumpled cyst wall resembles a small sand grain and as such may be over- looked (Fig. 5). Some forms to which Lauterbor
. The biology of the protozoa. Protozoa; Protozoa. Fig. 5.—Paramecium caudatum, stages in encystment. The final product may be easily mistaken for a sand grain. (After Michelson, Arch. f. Protistenkunde, courtesy of G. Fischer.) . days division within the cyst and ex-cystation were observed. Michelson (1928), furthermore, has described encystment of Para- mecium caudatum under conditions of slow desiccation entailing loss of peristome, vacuoles and cilia. When fully dried the crumpled cyst wall resembles a small sand grain and as such may be over- looked (Fig. 5). Some forms to which Lauterborn (1901) has applied the term "sapropelic fauna" appear to be able to live without free oxygen. Thus Frontonia leucas, Prorodon ovum, Spirostomum ambiguum, Pehmyxa palustris, P. binucleata, etc., which usually live in rela- tively clear waters, may also live in the sulphurous medium of putrefying vegetable and animal matter, while certain species of ciliates of fantastic form seem to require this peculiar habitat for their vital activities (Dactylochlamys pisciformis, Lauterb., Saprodi- nium dentatum, Lauterb., Discomorpha pectinata, Levand., Pelodt- nium reniforme, Lauterb.). Doflein, following the suggestion made earlier by Bunge, believed that the anaerobic parasitic forms of 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 perfectly resemble the original Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
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