MICS08COPIC FORMS OF ANIMAL LIFE. 



PLATE XIII. 



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LIFE-HISTORY OF FLAGELLATE INFUSORIUM 



Fig. 1. Normal form, showing three flagella, a, 6, c, and nucleus d. 



2. Anterior flagellum, a, 6, double ; c, nucleus. 



3. Fission commencing in nucleus c, and in anterior portion of body, a. 



4. Fission more advanced, and showing itself also in posterior portion of body, a. 



5. Fission still more advanced, both in nucleus, a, 6, and in body. 



6. 7. Fission proceeding to completion. 



8. Change to amoeboid condition, with single flagellum and granular band a. 



9. Conjugation of this with free-swimming form. 



10. 11. Stages of progressive fusion, terminating in production of still sac, 12 which afterwards 

 opens and pours out spores, as at 13, 14, the progressive growth of which is shown in figs. 15-21. 



