6o 



The Mycetozoa, and 



plasmodinm, gathers itself towards a central mass as shown 

 in Fig. 20 ; the central mass again differentiates itself into 

 a column and a surrounding mass of protoplasm which 

 clings round the attenuated central column, as shown 



Fia. 20. Pseudo-plasmodium of Polysphondylium violaceum. 

 (After Brefeld.) x about 25. 



in Fig. 21 ; it then begins to narrow in at intervals 

 along this column, and breaks up into discontinuous 

 lengths with intervening nodes, as shown in Fig. 22 (a). 



