Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 150 SYSTEMATIC ZOOLOGY. of motion and by their aid the animal swims through the water, or; if fixed, creates currents which bring food to it. Like other Protozoa these forms multiply by dividing into two or more individuals, this process in some being preceded by conjugation, which from its im- portance from a theoretical standpoint needs a few words. Conjugation is the union of two individuals. In many

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