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“A, Vorticella, a stalked ciliate Infusorian; I, contracted; 2, extended. f, food “vacuoles"; g, gullet; m, contractile fibre (muscular); n, nucleus; o, mouth, surrounded by ciliated disc; p.v., pulsating vacuole; s, stalk. B, a colonial type similar to Vorticella.” -Galloway, 1915


Thomas Walton Galloway Textbook of Zoology (Philadelphia, PA: P. Blakiston's Son & Co., 1915)


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