Conjugation of adults has been observed in several species, the most complete account being that of Zederbauer on Ceratium hirundinella (marine): either mate puts forth a tube which meets and opens into that of the other (as in some species of Chlamydomonas and Desmids); the two cell-bodies fuse in this tube, and encyst to form a resting zygospore. [Please select]
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Piece of lining of fourth stomach showing cysts of the encysted stomach worm (_Ostertatia ostertagi_) 523 18. [Please select]
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Portion of grass stalk bearing three encysted cercariæ of the common liver fluke (_Fasciola hepatica_) 527 22. [Please select]
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The tissue, thus encysted, gradually softens, becomes disintegrated, and breaks down into pus. [Please select]
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--Piece of lining of fourth stomach, showing cysts of the encysted stomach worm (_Ostertagia ostertagi_). [Please select]
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--Portion of grass stalk bearing three encysted cercariæ of the common liver fluke (_Fasciola hepatica_). [Please select]
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_] [Illustration: Vorticella microstoma, the encysted animal protruding through a supposed rupture of the tunic. [Please select]
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