48 EUGLENA less, iv 



surrounds itsejf with a cyst of cellulose (Fig. 5, G, ly), from 

 which, after a i)criod of rest, it emerges to resume active 

 life. 



Reproduction takes place by simple fission of the resting 

 form, the plane of division being always longitudinal (g). 

 Sometimes each product of division or daughter-cell divides 

 again : finally the two, or four, or sometimes even eight 

 daughter-cells emerge from the cyst as active Euglenai. 

 A process of multiple fission (p. 42) has also been de- 

 scribed, numerous minute active spores being produced 

 which gradually assume the ordinary form and size. 



