FIG. 21. Sexual reproduction of Fucus, showing the eight eggs (six in sight) dis- 

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

 from the membrane (#), antheridium containing sperms (C), the discharged lat- 

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

 After SI\GRR. 



21 



