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List of objects found in the Croton water, winter of 1881 and 1882. The specimens obtained by filtering about one barrel of water: 1. Acineta tuberosa. 2. Actinophrys sol. 3. Amoeba proteus. 4. " radiosa. 5. " verrucosa. 6. Anabaina subtularia. 7. Ankistrodesmus falcatus. 8. Anurea longispinis. 9. " monostylus. 10. Anguillula fluviatilis. 11. Arcella mitrata. 12. " vulgaris. 13. Argulus. 14.
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