90 



Fig. 142. Nitzschia acicularis , (5), cells U0-150u long, 3-^U wide; 

 carinal dots small, 17-20 in 10u; frustule delicate. 

 X 1000. 



valve view 

 Notes : 



Fig. 1^3. Nitzschia amphibia , (5), cells 12-50u long, 3-5u wide; 

 7-9 carinal dots in lOu; striae with distinct punctae, 

 15-19 in lOu. X 1000. 



Notes: carinal dot 



Fig. lM*. Nitzschia angustata, (5), cells 20-110u long, 5-lOp 

 wide; carinal dots indistinct; 12-18 striae in lOp. 

 X 1000. 



valve view 

 Notes : 



