^//^^. 



% more '^ 



H 



^'^ that p,, I 



into \ 



T 



) 



aratnecia 



ortice!- 



» 



IS of Tri 



3f M. Jules H 



I 



le 



Oxytrichs 



It; 



become encfsli 



during 



ges^ 



DfFj and that 



Fig. 90,^, 



,x began their exifc^ 

 e which arise ftoaci 

 e from their cj*=' 



ult. 



strong 



terms 



ofi« 



to 



:*1 



'^ 



Jde'i "■ 



• with respect 

 when Clap^^^ 



d by Df- \ „y 



are 



that 



an 



,ject5 undef 



d *" 



7:^^ BEGINNINGS OF LIFE. 



497 



stages of this very interestin 

 inutelv described bv M. Haime 



as a very diminished representative of its Oxytricha- 



progenitor. All the 



transformation are r 



in his memoir, and have also been very carefully de- 



Uneated in numerous figures— and to these we must 



r 



refer the reader who wishes for further particulars. 



We may state, however, that Mr. H. J. Carter 2 

 seems to have witnessed somewhat similar changes, 

 by which specimens of Kerona pustulata 3, after encyst- 

 ment, gave rise to Pl^sconia Charon — a form closely 

 allied to Trickoda lynceus. M 



has shown! accepting such a conclusion because he did not actually 



see 



the specimens of FUsconla Ckaron issue from the 

 previously-observed cysts • and therefore with excessive 

 caution — though for reasons which do not now carry 

 much weight — he thinks that they may not have done 

 SO5 and rather inexcusably suggests that M. Haime may 

 also have made some mistake. Yet Mr. Carter had 

 put numerous specimens of encysted Kerona aside in 

 three separate watch-glasses^ and in each of these 

 receptacles, at about the same time that the embryos 



within some of the 



cysts began to 



show signs of 

 activity, he noticed the presence of empty cysts and 

 also that specimens of Vlasconta were to be seen 

 swimming about in the watch-glasses. As not a single 

 active Kerona could be detected, the specimens of 



1 < 



VOL. II 



Ann. des Sc. Nat/ 1853 (Zoologie), PI. 6 

 'Ann. of Nat. Hist.' 1859, PP* 251-255. 

 See p. 242, note i. 



Kk 



