77 



Fig. 121. Navicula pygmaea , (5), cells lO-^u long, Q-2k\i wide; 

 about 26 striae in 10n. X 1000. 



valve view 



Notes 



Fig. 122. Navicula radiosa , (5), cells ^0-120u long, 8-20u wide; 10- 

 12 striae in lOu. X 1000. 



5^ 



valve view 



Notes : 



Fig. 123. Navicula Reinhardtii , (5), cells 35-70u long, l4-20u 

 wide; 7-9 striae in lOu. X 1000. 



valve view 



Notes 



