Explanation of Plate I. 



Pag. 



Fig. 1. Actinoptychus moronensis (Grev.) Gl. var. nov. guttata Öst 118 



— 2. Cyclotella transsylvaniea Pant. var. dessiminato-punctata Pant.... 116 



— 3 a. Eu'phylloclium spathulatum Shadbolt 126 



— b. — — — Structure X 1500 126 



— c. - — — Frustule 126 



— 4. Triceratium sp 121 



— 5. Rutilaria recens Gl. ? 123 



— 6. Rhaphoneis bilineata GI. & Grun. var. contracta Grun.? 128 



— 7. Navicula balatonis Pant 134 



— 8. Glyphodesmis siamensis Öst. forma minor 129 



— 9. — — — 128 



— 10. Navicula ( Pinnularia) Yardmen öst 134 



— 11. — (Caloneis) siamensis Öst 135 



— 12. Cyclophora siamensis Öst 131 



— 13. Striatella delicatnla (Ktz.) Grun. var. gibbosa Öst 124 



— 14. Achnanthes mammalis Gast 131 



— 15. Achnantes javanica Grun. var. rhombica Grun 130 



— 16. — _____ Epitheca 130 



With exception of fig. 3 b, the figures have been enlarged 660 times. 



