Page:Transactions of the Royal Society of Tropical Medicine and Hygiene, volume 2 (3).djvu/8

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to divide their life-cycles into three stages, preflagellate, flagellate and postflagellate, and it should be clearly

Plate I.

understood there is no hard and fast line dividing one stage from the other; they merge into each other. You will, however, see that by studying these flagellates

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