FORAMINIFERA 



495 



spheric individuals which produce tests and emerge from the cyst 

 (Si). They grow into mature megalospheric forms which measure 

 60-72/x in diameter. Two to four such individuals become associated 



A B C 







<® 



Fig. 208. Developmental cycles of Foraminifera (Myers). A, Spirilhna 

 vim-para; B, Discorbis patelliformis; G. Elphidium crispa. 1, microsphere 

 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 microsphere forms, a-c, enlarged views 

 of one in each species. 



