59 



Fig. 84. Cymbella sinuate , (5), cells 10-40u long, 4-9n wide; 



9-11 striae in 10|i; do not confuse with Achnanthes sp. 

 X 1000. 



i t<mn 



valve view 



Notes : 



Fig. 85. Cymbella tumida , (5), cells 40-105U long, 15-23(iwide; 



8-10 striae in lOu; central area with a ventrally placed 

 isolated puncta. X 1000. 



valve view 



Notes : 



Fig. 86. Cymbella turgida, (5), cells 30-100 u long, 9-25u wide; 7-9 

 striae in lOu; similar to C. ventricosa , but larger 

 and with more conspicuous punctae. X 1000. 



TTntTTnTTrmTTTiTTnrm'i 



valve view 



Notes : 



