80 



SYNGAMY IN PROTOZOA 



Fig. 45. — Diagrammatic Representation of the Nuclear Changes during 

 Conjugation of Paramecium caudatum. (After Jennings, 1920.) 



A. Two associated conjugants. 



B. T)egeneration of macronucleus and first division of niicionucleus. 



C. Second division of micronuclei to give rise to four, of which three degenerate. 



D. Division of remaining micronuclei to produce the gamete nuclei. 



E-F. Union of gamete nuclei. G. Separation of the conjugants. 



H-J. Division of the nuclei to give rise to eight, of which four increase in size to become macro- 

 nuclei, while three degenerate. 



K. After division of the single micronucleus the ciliate itself divides. 



L. After a further division of the micronucleus the daughter ciliates again divide to give rise t(3 the 

 normal type. 



