PLANCHE II 



FIGURE p AGE 



1,2. Acbnauthes Delpiroui M. Per. (Tambour). 113 



3. Pages! M. Per. (Tambour) 114 



4, 5. pseudo-antiqua M. Per. (St- 



Alyre) 13 



0,7,8. i'ossilis M. Per. (Ste-Marguerite) 89 

 9. laneeolata Breb. var. maxima 



M. Per. (Volvic) 30 



10,11. Leveillei Henb. (St-Alyre) ... 11 



12,13. Bacillum M. Per. (Tambour). 113 



14-16. Martyi Herib. (Ste-Marguerite) 89 

 17. Gomjlioueina dubravicense Pant. var. gai- 



lica M. Per. (Volvic) 32 



18,19. Ampliiprora llieufii Herib. (Bais) 106 



20. Sigma radiata M. Per. (St-Martial) 100 



21. Navicula sculpta var. gigantea M.Per. (Ste- 



Marguerite) 93 



22. debilitata M. Per. (Bais) 108 



23. Brebissouii Ktz. var. intermedia 



M. Per. (Ste-Marguerite) 92 



24. Diploneis interrupta Cleve. var. major M. 



Per. (Bais) 107 



25. Diploneis interrupta Cleve. var. i'ossilis ivi. 



Per. (Bais) 107 



26-27. Melosira spinuligera M. Per. (Coudes) 121 



28-29. var. spinulosissima M. 



Per. (Coudes) 121 



30. Hantzschia amphioxys Grim. var. hispida 



M. Per. (Ternant) 136 



31. Hantzschia amphioxys Grun. var. crassa M. 



Per. (Bais) 107 



