Plate 96 



Fig. 1. Phaeothamnion confervicola Lagerheim, x 590 



Figs. 2, 3. Ophiocytium desertum var. minor Prescott, x 590 



Figs. 4, 5. Ophiocytium parvulum (Perty) A. Braun, x 590 



Fig. 6. Bumilleria sicttla Borzi, x 590 



Figs. 7-9. Tribonema affine G. S. West, x 500 



Fig. 10. Tribonema bombycinum ( C. A. Ag. ) Derbes & Solier, 



x600 



Fig. 11. Tribonema bombycintwi var. tenue Hazen, x 750 



Figs. 12, 13. Tribonema minus (Wille) Hazen: 12, x 590; 13, x 1000 



Figs. 14-16. Tribonema iitriculosum (Kuetz. ) Hazen: 14 and 15, 

 x 590; 16, x 800 



Figs. 17, 18. Bofryditim granulatum (L.) Greville: 17, x 18; 18, x 4 



Fig. 19. Mallomonas alpina Pascher & Ruttner, x 500 



Fig. 20. Mallomonas acaroides var, Moskovensis (Wermel) 



Krieger, x 590 



Fig. 21. Derepyxis amphora Stokes, x 700 



Fig. 22. Mallomonas acaroides Perty, x 750 



Fig. 23. Mallomonas pseudocoronata Prescott, x 500 



Fig. 24. Mallomonas elliptica (Kisselew) Conrad, x 500 



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