— 190 — 



Figure Page 



32. Nitzschia bilobata W. Sm. var.. fossilis M. 



Per. (Ste-Marguerite) ■•• 93 



33. Nitzschia dubia W. Sm. var. minor M. Per. 



(Ternant) 139 



34. Hantzschia amphioxys Grun. var. arverna 



M. Per. (Ternant) 136 



35. Scoliopleura gallica M. Per. (Ste-Margne- 



rite) 94 



