75 



Fig. Il6. Navicula gastrum , (5), 25-60u long, 12-20u wide; 8-10 striae 

 in 10u. X 1000. 



valve view 



Notes : 



Fig. 117. Navicula hungarica , (5), cells 10-30u long, ^-7n wide; 



8-10 striae in 10|i. X 1000. Abundant in the southwest. 



valve views 



N. hungarica 



var. capitata 



Notes : 



