Plate II. 



Fig. 19. Pliotümorphic action of the filamentous pi'otonenia of Sehistostega 

 osmundacea (Dicks.) Mohr. ; / first direction of rays ; J direc- 

 tion of rays after being turned 180°. 



Fig. 20. Normal position of the chroniatophores in tlie cell of the protoneraa 

 in its native place (Escharostrophe). 



Fig. 21. Shoot put in a 0,1^ solution of calcium chloride for 2 months. 



Fig. 22. ïadpole-shaped prutonema. 



a) one that is separated from its mother cell. 



