Fig. 159- 



96 



Nitzschia sigma , (5), cells 50-70U long, 4-15u wide; 

 7-12 carinal dots in lOu; 22-30 striae in lOji. X 1000. 





I i l( I I I I I I II I I I 1 I 1 I I 1 I LU 



valve view 



Notes 



Fig. l60. Nitzschia sigmoidea , (3), cells l60-500u long, Q-lk-u 

 wide; 5-7 carinal dots in 10m; striae distinct, 23-26 

 in lOu. 



"'""""" "" lii iiii ' i i i fi ni ii ii iiiii rr*~* 



"" ' ' ""'"^w m ^ m . iiimnifi.iMf 



girdle view 



X 500 



valve view 

 X 1000 



Notes 



Fig. l6l. Nitzschia sinuata , (5), cells 20-50u long, 5-8u wide; 



5-6 carinal dots in 10n; about 18 striae in lOu. X 1000. 



valve views 



Notes : 



