4^2 THE BEGINNINGS OF LIFE, 



decoloLirization, and becomes converted into a finely- 

 granular spherical or ovoidal mass before any cilia are 

 protruded. Such bodies, devoid of cilia, may occasion- 

 ally be ssen lying side by side with others, in which 

 short cilia exist— either wholly motionless or with a 

 few of them exhibiting slight flickering movements 

 (Fig. ^6^ c). Some of these were embryos of unknown 

 forms of Ciliata; though others, judging from the dis- 

 position of their setae, seemed undoubtedly to be embryo 

 forms of Oxytricha\ On another occasion the decolour- 

 ized spheres became hemispherical, and protruded stout 

 setse from the under surface, which soon began to ex- 

 hibit slow movements after the fashion of Trichoda. 

 Dr. Gros also expressly states ^ that he has seen Euglense 

 become decolourized without previous encystment, 

 develop cili^, and take on the very special characters 

 of Coleps; whilst elsewhere^ he seems to imply that 

 Vorticella, Nassula, Oxytricha, and Enchelys may be 

 produced in a similarly simple manner from transform- 

 ing Euglense. And yet, with reference to each of these 

 forms, he is also careful to add that their appearance 

 upon the scene may be the result of transformations 

 taking pkce in quite different matrices. 



So far as I have at present observed, the majority of 

 those Euglenas which become encysted at or before the 

 period of transformation, are converted into spherical 



^ Very similar to that of Fig. 90,/. 



2 Loc. cit.. p. 314, PI. E, fig. 2'j a, b, c. 



3 Loc. cit., pp. 3c6, 312, 336, PI. E, fig. 23-36. 



