. Bulletin - United States National Museum. Science. 20 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. slieimer describes certain cysts with sj)iiidle-shaped nuclei found in the tadpole. These he regards as encysted zygotes. I have not ob- served them, nor has Brumpt (1915) been able to find them. Their further fate has not been followed. The zygotes thus formed in the recta of the tadpoles resemble the full-grown Opalinids, except for size and the fact that they have bat a single nucleus. The details of development into full-sized Opalinids have not been followed. Growth and multiplication occu
. Bulletin - United States National Museum. Science. 20 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. slieimer describes certain cysts with sj)iiidle-shaped nuclei found in the tadpole. These he regards as encysted zygotes. I have not ob- served them, nor has Brumpt (1915) been able to find them. Their further fate has not been followed. The zygotes thus formed in the recta of the tadpoles resemble the full-grown Opalinids, except for size and the fact that they have bat a single nucleus. The details of development into full-sized Opalinids have not been followed. Growth and multiplication occur during the first month much as they do among the larger forms, Brumpt (1915) has found that after some weeks the Opalinids in the recta of the tadpoles show an epi- demic of division followed by encystment, the cysts being infection cysts identical structurally with those in the adult hosts in the spring of the year. This process continues the abundance of the cysts in the pools and renders more certain the infection of the tadpoles. 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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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
