. Bulletin - United States National Museum. Science. THE OPALINID CILIATE IXFUSORIAXS, 115 This species resembles Z. hylaxena in form of body and in size of nuclei. The individuals with resting nuclei are very similar and could hardly be distinguished, though the endospherules of the latter species are larger. But the nuclei of dividing individuals are very different. In Z. Mjlaxena fission is consummated when the two nuclei are each in a very constricted dumb-bell form, while in a similar fission stage of Z. venezuelae the nuclei are ellipsoidal and wholly unconstricted, a much earlier mitoti
. Bulletin - United States National Museum. Science. THE OPALINID CILIATE IXFUSORIAXS, 115 This species resembles Z. hylaxena in form of body and in size of nuclei. The individuals with resting nuclei are very similar and could hardly be distinguished, though the endospherules of the latter species are larger. But the nuclei of dividing individuals are very different. In Z. Mjlaxena fission is consummated when the two nuclei are each in a very constricted dumb-bell form, while in a similar fission stage of Z. venezuelae the nuclei are ellipsoidal and wholly unconstricted, a much earlier mitotic phase. As the nuclear phenom- €na are the most fundamental in the speciation of the Protoopalinas and Zelleriellas, I do not hesitate to recognise Z. venezuelae as a. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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