THE ALGAE 



71 



FLAGELLA 



EYESPOT 



PYRENOID 



CHLOROPLAST 



Fig. 51. — Volvox rousseletii. Mature antherozoids. (After Rich.) 





Fig. 52. — Volvox aureus. Two antherozoid clusters seen 

 in surface and in marginal aspects respectively. 



Nucleus 



"^i 





Pyrenoid 





Fig. 5 3 . — Volvox aureus. Young oospheres before 

 fertilization. 



