THE BEGINNINGS OF IIFE. 



463 





Fig. 86. 

 Modes of Origin and Development of Ciliated Infusoria. ( x 600.) 



a. A transfoi-ming Euglena, with red ' eye-speck ' still visible. 



b. A similar body, having many of its chlorophyll corpuscles still 



green, fringed with almost motionless cilia. 



c. A completely decolourized sphere derived from a transformed 



Euglena, provided with a few partly-motionless cilia. 

 d and e. More advanced forms of a similar embryo developing into a 

 Dileptus (?). 



/. Vorticella, soon after its emergence from a cyst of Euglena 

 origin, which subsequently develops into a striated 

 variety {g). 



h. A large Chlorococcus-vesicle, whose- contents gradually under- 

 goes decolourization (;), and at last becomes converted into 

 an animalized mass {k), which gradually shapes itself into 

 the form of an Oxytricha (/). This after a time ruptures its 

 cyst and soon takes on the characteristics shown at m. 



n. A form of Plaesconia derived from an embryo produced within 

 other, apparently similar, Chlorococcus-vesicles. 



I 



