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.) Øst. 



— 6. Neidium islandicum sp. nov. 



— 7. Neidium lineare sp. nov. 



— 8. Neidium panduriforme sp. nov. 



— 9. Diploneis ovalis (Hilse) 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 Grün. var. capitata var. nov. 



— 17. Stauroneis perexilis sp. nov. 



