90 



PLATE I. 



Fig. 1. Caloneis Fedderseni sp. nov. 



2. Caloneis islandica sp. nov. 



3. Caloneis Jonssoni sp. nov. 



4. Caloneis procera sp. nov. 



5. Neidium incurvum (Greg.) 0st. 



6. Neidium islandicum sp. nov. 



7. Neidium lineare sp. nov. 



8. Neidium panduriforme sp. nov. 



9. Diploneis ovalis (Hilsej Cl. f. subinflata. 

 10. Diploneis subovalis Cl. 



11 Frustulia islandica sp. nov. 



12. Navicula Bacillum Ehr. var. densestriata var. nov. 



13. Stauroneis anceps Ehr. var. elliptica var. nov. 



14. Stauroneis bifissa sp. nov. 



15. Stauroneis elegantula sp. nov. 



16. Stauroneis parvula Grun. var. capitata var. nov. 



17. Stauroneis perexilis sp. nov. 



