74 



Fig. 114. Navicula cuspidata , (5), cells 50-170U long, 17-37U wide; 

 striae fine, 11-19 in 10^. X 1000. 



valve views 



N. cuspidata 



var. ambigua 



Wi 



mSijiii'M 



HHBi^ 



IBmm 



Notes : 



var. Heribaudi 



Fig. 115. Navicula exigua , (5), cells 10-35H long, 7-15U wide; 

 12-14 striae in lOu. X 1000. 



Notes 



