i/r^ 



cover 

 are 



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 P^one to L 



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fi-equej... 



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^j without a ■ f 



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■dduccd sufficinq;' 



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and intercli; 



5, Peranemata, 1!* 



;hcse forms and t; 



Not only are t 



but, now one oo' 



Tied by 



whether we 



alizing porW!^' 



1 



e 



after encysting'' 



rted into eni"| 



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d that a s#; 



1 



the case 



\nd, ^^'^ 



oM 



pp. 



\-o, fof 



,,4 and ^^5 



Oct.'8l''''^ 



for bis : • 



res reason -^^_,^^, ^f, 

 .Itoge 



ther 



artifc'' 



TJIE BEGINNINGS OF LIFE. 



505 



Althou2;li as a 



Dr. Gros, such is actually the case, 

 general rule the Actinophrys tends to become converted 

 into one or other of the Ciliated Infusoria^ and exists 

 in this intermediate state for a time before assuming 

 the form of a Rotifer \ still this is not always so. 

 Occasionally a large Actinophrys may be transformed 

 at once into a Rotifer or some other higher form. 

 Their ultimate fate seems to depend principally upon 



their origin, siz 



and general vigour. 



The 



largest 



specimens may give off buds which become converted 

 into Ciliated Infusoria 2, although the parent mass sub- 

 sequently develops into one or other of the more com- 

 plex Rotifers. Dr. Gros says:— ^Quand la metamor- 

 phose ascendante approche^ ils retirent successivement 

 tous leur cils ; diminutifs etonnants de sugoirs polypiens 

 (PL L^ fig. 9) et se transforment directement en Rota- 

 toires/ And elsewhere ^^ the same observer also speaks 

 of the direct conversion of large Euglenge into Amoeb-x 

 and Actinophrys, and of the ultimate transformation 

 of some of them into Rotifers. 



There are, however, other facts not yet stated which 

 suffice to give a double interest to the transformations 

 of Actinophrys and of Ciliated Infusoria into Rotifers. 



^ Speaking of the large specimens of Actinophrys, Dr. Gros says (loc. 

 cit., p 436) : — ' Un trait qui est gt^neral, c'est qu'ils tendent tous vers les 

 utriculeux cilics, et ces dernieres pousseront aux Rotatoires ovigeres ou 

 pangcniques selon la derivance/ (See also p. 451.) 



^ Loc. cit., p. 436, PL J, fig. i6. 



^Loc. cit., pp. 331 and 335. 



