. An elementary course of practical zoology. Zoology. 270 OPALINA presents a condition of things intermediate between the unicellular and the multicellular types of P'lG. 71.—Opalina ranaium. A, living specimen, surface view, showing longitudinal rows of cilia. B, the same, stained, showing numerous nuclei {nu) in various stages of division. C, I—6, stages in the division of a nucleus, D, longitudinal fission. E, transverse fission. F, the same in a specimen reduced in size by repeated division. G, final product of successive divisions. H, encysted form. I, uninucleate form produce
. An elementary course of practical zoology. Zoology. 270 OPALINA presents a condition of things intermediate between the unicellular and the multicellular types of P'lG. 71.—Opalina ranaium. A, living specimen, surface view, showing longitudinal rows of cilia. B, the same, stained, showing numerous nuclei {nu) in various stages of division. C, I—6, stages in the division of a nucleus, D, longitudinal fission. E, transverse fission. F, the same in a specimen reduced in size by repeated division. G, final product of successive divisions. H, encysted form. I, uninucleate form produced from CA,-st. K, the same after multiplication of the nucleus has begun. {From Parker's Biology: A—C, after Pfit;:ner ; D—K. from Saville Kent, after Zeller.) There is no contractile vacuole, and no trace of either mouth or gullet, so that the ingestion of solid food is impos- sible. The creature lives, as already stated, in the intestine. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Parker, William Newton, joint author. London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
