All figures with exception of Fig. 7 represent the same individual in different stages. 

 From a pond on the ice, taken July 30, 1894. 



For description of figures see pp. 16—19. 

 Figs. 1—6. Living. Freehand sketches drawn with Zeiss obj. F, oc 4, on July 31, 1984 

 morning. 



Fig. 7, A — C. Living. Two similar organisms (A and B is the same individual). Freehand 

 sketches, Zeiss obj. CC, oc. 5. July 31, 1894, morning. 



Fgs. 11— 20. Living. Zeiss obj. F, oc. 2; freehand sketches. July 31, before and afternoon. 



