PLANCHE III 



FIGURE 



1. Siinicllu (Jouderti Hei 

 2. 

 3. 



PAGE 

 (Ternant) 140 



var. minor M.Per.(Ternant) 140 

 Lmearis \\ . Sin. vur. minor i' a con- 

 stricta 1L. Per. (Tanibour) 117 



4. ovalis Breb. var. liuearis M. Per. 



(Ternant) 141 



5. ovalis var. cuiieata M.Per. (Ste-Mar- 



guerite) 9(J 



(i. ovalis var. fossiiis ^[. Per. (Ste-Mar- 



guerite; ( J6 



7. ovalis var. elongata M. Per. (St-Mar- 



tial) 101 



8. Cliassagnei Herib. (Ternaut) 140 



9. Rhopalodia Museums Per. var. capitata M. Per. 



(Ste-Marguerite) ( J4 



JO. Fragilaria Bacillum M. Per. (Ternant) l-'iG 



11. Niizschia Tryblionella var. gigantea M. Per. 



(Ste-Marguerite) 94 



1'J. Stoliczkiana Grun. var. arverna M. 



Per, (Tambour) 117 



13. vitrea Norm. var. scintillans M. Per. 



(Ternant) 139 



14. Couderti Herib. (Ternant) 138 



15. Synedra minuscula Grun. var. undulata M.Per. 



(Volvic) 34 



Hi. acus Ktz. var. fossiiis f a anomala M. 



Per. (St-Alyre) 124 



17. a f finis Ktz. var. thermalis M. Per. 



(Volvic) :!l 



18 ulna Eli. var. curta M. Per. (Volvic). 31 



