Plate XIV; Figures 85 to 89. 



Fig. 85. Mougeotia sp. ( ?) ( 500 diameters) . page 68 

 Figs. 86 to 89. Ulothrix sp. ( ?) ( 1000 diam- 

 eters, except 86a, which is 500 

 diameters) ..... "49 



