144 CONJUGATION, MATURATION, AND FERTILIZATION 



characterized as follows: Two are destined to degenerate as "reduc- 

 tion nuclei," four become the centres of shell formation of the spores, 

 four become centres of pole capsule formation, and four remain as 



Cf 





^k 



Autogamy in Ameba proteu.s. In ui^per figure secondary (gametic) nuclei are shown 

 emerging from the primary nuclei. In central figure is pictured the union of gametic nuclei 

 together with some' undeveloped ones in a jirimary nucleus. In lower figure is shown the 

 mass of sporoblasts which develop from the fertilized gametes. (After Calkins.) 



