16 



Fig. 118. Navicula mutica , (5), cells 10-kO\i long, 7-12u wide; 15-20 

 striae in lOu; single eccentric puncta in the central area. 



X 1500. 



valve view 



Notes 



Fig. 119. Navicula peregrine., (5), cells 50-150u long, 10-30u wide; 

 5-6 striae in 10\i. X 1000. 



Uiii|^l#ii/7 



5lala|rM||i|iiyAs*e»*^ 



valve view 



Notes : 



Fig. 120. Navicula pupula , (5), cells 20-40u long, 7-10u wide; 22-26 

 striae in 10|i; no striae at the poles; central area 

 quadrangular; can mistake for N. bacillum. X 1000. 



«r — : — •>, 



Notes : 



valve view 

 var . capita ta 



