PLANCHE II. 



Fig. 



1. Melosira Borreri Grev. var. ignimontana J. Br. etF. Herib. 



b, face connective. 



2. Navi'cula icostauron Cl. et Grun. var. conifer a J. Br. et 



F. Herib. 



3. recta J. Br. et F. Herib. 



4. aquitanios J. Br. etF. Herib., dessine a ~. 



a, var. undulata. 



b, type. 



5. basaltceproxima J. Br. et F. Herib. 



c, var. bigibba. 



d, type. 



6. Tetracyclus decoratus J. Br. et F. Herib. 



rf, face valvaire. 



7. Periptera saxogallica J. Br. etF. Herib. 



, J, face connective. 



c, face valvaire. 



d, frustule entier. 



8. Striatella Girodi F. Herib. et J. Br. 



c, face connective. 



9. Melosira Heribaudi J. Brun. 



a, face valvaire. 



b, face connective. 



Grossissement ~. 



