396 



PROTOZOOLOGY 



and viscous substance. Within the "multiple fission cyst," nuclear 

 and cytoplasmic fissions form numerous small uninucleate megalo- 

 spheric individuals which produce tests and emerge from the cyst 



A B r 



Fig. 184. Developmental cycles of Foraminifera (Myers). A, Spirillina 

 vivipara; B, Discorbis petalliformis; C Elphidium crispa. 1, microspheric 

 forms; 2, megalospheric forms, a-c, enlarged views of young megalo- 

 spheric forms; 3, beginning of sexual reproduction; 4, gamete and zygote 

 formation, a-c, gametes; 5, young microspheric forms, a-c, enlarged views 

 of one in each species. 



