124 



LIFE AND DEATH. 



[111. 



representative, indicated, when he named the group ' Catal- 

 lacta.' 



According to Gotte, the natural death of MagospJiaera con- 

 sists, as in the undoubted Protozoa, in a process of reju- 

 venescence by encystment. The dissolution of the ciliated 

 sphere into single cells 'cannot be identical with natural death. 



Development of Magosphaera planula (after Hackel). 



I. Encysted amoeboid form. 2 and 3. Two stages in the division of 

 the same. 4. Free ciliated sphere, the cells of which are connected by 

 a gelatinous mass. 5. One of the ciliated cells which has become free 

 by the breaking up of the sphere. 6. The same in the amoeboid form. 

 7. The same grown to a larger size. 



For the regular and complete separation of the Mai^osphaera- 

 cells proves that their individualit}' has not been completely 

 subordinated to that of the whole colony, and it proves that 

 the latter is not completely individualised'.' 

 Nothing can be said against this, if we agree in identifying 



^ 1. c, p. 78. 



