Asexual reproductive cell 



Cell bodies of 

 somatic cells 



Daughter 

 colony 



Protoplasmic 

 strand 



Flogellum 

 Gelatinous matrix 



Side view of 

 somatic cells 



ASEXUAL REPRODUCTION Stages 

 in the development of daughter 

 colonies 



Sperm bundle (surface view) 



Sperm bundle (side view) 

 Unfertilized egg 



SEXUAL REPRODUCTION 



Stages in the development 



of sperm bundles 



Fertilization of egg 



Free sperm bundle 

 Zygote 



Zygote 



SEXUAL REPRODUCTION Stages in development, 

 fertilization and encystment of eggs 



Figure 22. Volvox, the largest of the colonial flagellates, is a sphere of from 500 to 40,000 

 cells. The whole organism barely attains the size of a pinhead. When the flagella vibrate, the 

 organism revolves through the water. Its reproduction is described on page 562. 



48 



