

Fig. 21. Sexaal reprodnction of Fncs, showing the eight eggs (six in sight) dis- 

 charged from the oogonium and surrounded by a memhrane (A), eggs liberated 

 from the membrane (£), antheridlum containing sperms ( C), the discharged lat- 

 erally biciliate sperms (G), and eggs surrounded by swarming sperms {F, H). — 

 After SiSGER. 



21 



