238 



THE BEGINNINGS OF LIFE. 



Structure, having no trace of an oral aperture, though 

 like the Monads they display an internal vacuole, and 



a. Group of VcrticellcB. 

 c. Kolpoda. 



Fig. 62. 



Ciliated Infusoria. 



b. Single Vorticella, more highly magnified. 

 d. Paramecium. e. Enchelys. 



like them also they may or may not possess a simple 

 nuclear particle. They present the same variations in 

 form which are to be met with amongst Monads, and 

 they differ from them only by the possession of vibratile 

 cilia over most of their body, instead of possessing 

 one much longer flagellum. They are, moreover, not 

 unfrequently met with in large numbers in situations 

 in which Monads abound. 



Pineau says he has watched the development of 

 organisms of this kind in a pellicle which formed on 

 an infusion of isinglass. The first stagey were alto- 

 gether similar to those which he has described as having 



