356 Animal Biology 



MEGANUCLEUS 

 MICRONUCLEUS 



FUSION NUCLEUS 



FISSION 



FUSION NUCLEUS 



FISSION 



\0 \ t)\ FISSION 

 » \/ » 



C •CONJUGANT CARRIES ON 



NORMAL OFFSPmNa OF 



Fig. 172. — Paramecium caudatum reproducing by conjugation, shown diagram- 

 matically. The meganucleus is also known as the macronucleus. (From Parker 

 and Clarke: Introduction to Animal Biology, the C. V. Mosby Co.) 



