T^ 



462 



-'S 



THE BEGINNINGS OF LIFE. 



decolourization^ 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 seen 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. U, c\ 



embry 



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

 position of their set^, seemed undoubtedly to be embryo 

 forms of Oxytricha\ On another occasion the decolour- 

 ized spheres became hemispherical, and protruded stout 

 setx 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 Euglence 

 become decolourized without previous encystment, 

 develop cilise^ 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 Euglenae. And yet, with reference to each of these 



r 



forms, he is also careful to add that their appearance 

 upon the scene may be the result of transformations 

 taking place in quite different matrices. 



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

 those Euglen^ which become encysted at or before the 

 period of transformation, are converted into spherical 



^ Very similar to that of Y\<g. 90,/. 



2 Loc. cit., p. 314, PI. E, fig. 27 a, &, c. 



3 Loc. cit., pp. 306, 312, 336, PI. E, fig. 23-2*^. 



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 Eugler 



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