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 (j), antheridium containing sperms (C), the discharged lat- 

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

 After SINGER. 



