Plate X ; Figures 72 to 77. 



Fig. 72. Palmella mucosa Kiitz. ( ?) (250 

 diameters) ..... 



Fig. 72a. A colony of the same, natural size . 



Fig. 7$. Pleuro coccus vulgaris Menegh. (500 

 diameters) ..... 



Fig. 74. Volvox. A young colony. (500 

 diameters) ..... 



Fig. 75. Volvox aureus Ehrb. (200 diameters) 



Fig. 76. globator Ehrb. ( 125 diam- 



eters) ... 



Fig. 77. Tctraspora gelatinosa (Vauch.) Desv. 

 (250 diameters) .... 



Fig. 77a. A colony of the same, natural size 



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