Immature oocytes 



Mature ovum emerging from, follicle 



Portion of egg Emerged portion Point of follicle Theca Empty (collapsed) Immature 



still in ovarian of egg rupture externa follicle sacs oocytes 



of ovary 



Follicle wall 



\ 



Emerging egg 



^ 



Two -thirds 

 emerged 



Half emerged 



Fully emerged 

 note shape) 



3 ^^ ' 

 __ ^^p emerged ^^m^^^ 



^■^^^ ^^m H^^^l^l^i, ^ (note 



Follicular rupture and ovulation in the frog. {Top, left) Three eggs emerging 

 simultaneously from their follicles. {Top, right) Eggs in various stages of emer- 



{Continiicd on facing page.) 



52 



