PLANCHE II 



Figure Page 



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



3. Pagesi M. Per. (Tambour) 114 



4, 5. — pseudo-autiqua M. Per. (St- 



Alyre) 13 



6,7,8. fossilis M. Per. (Ste-Marguerite) 89 



9. lanceolata Breb. var. maxima 



M. Per. (Yolvic) 30 



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



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



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

 17. Gomphonenia dubraviceuse Pant. var. gal- 



lica M. Per. (Volvic) 32 



18,19. Amphiprora liieufii Hérib. (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. — Brebissonii Ktz. var. iutermedia 



M. Per. (Ste-Marguerite) 92 



24. Diploneis interrupta Cleve. var. major M. 



Per. (Bais) 107 



25. Diploneis interrupta Cleve. var. fossilis M. 



Per. (Bais) 107 



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



28-29. — var. spinulosissima M. 



Per. (Coudes) 121 



30. Hantzschia amphioxys Grun. var. liispida 



M. Per. (Ternant) 136 



31. Hantzschia amphioxys Grun. var. crassa M. 



Per. (Bais) 107 



