PLATE LXIV. 



Figures magnified 500 diaiiioters- 



Page. 



Fig. 1. Penium Digitus, . . 34 



Figs. 2, 3. Stadk.\stbum BBEVitiPiSA, front and end views, . . 134 

 " 4, 5. Staueastrum inconspicuum, . ■ . 137 

 '■ 6, 7. starkastrum duplex, .... 164 

 Fig. 8. Htalotheca undulata, . 23 

 Figs. 9, 10. Closterium stkigosum, two zygospores with etnpty cells at- 

 tached, . . . . 44 



Fig. 11. EUASTRDM MDLTILOBATUM, . 107 



Figs. 12, 13. MiCRASTERIAS CONPERTA, . 12ti 



'' 14, 15. COSMARIUM EXCAVATUM, 85 



Fig. It). DOCIDIUM CORONULATCM, . 53 



" 17. PeDIASTRUM SIMPLEX, , . . lt)8 



" 18. Pediastrom Stcrmii, . . 168 



" 19. Pediastriim simplex, Var., . 168 



" 20. PeDIASTRI'M BCODENAKIUS, 168 



" 21. Pedia-strum forcipatbm. . 169 



Figs. 22, 23. Pediastrum Ehrenbergii, 170 



Fig. 24. Pediastrum tetras, . 170 



Figs. 25, 26. Pediastrum Ehrenbergji, 170 



Fig. 27. " " variety, . . 170 



" 28. Pediastrum angulosum, . 162 



" 29. Pediastrum Bobyanum, . 169 



Figs. 30, 31. Pediastrum forcipatum, . 169 



Fig. 32. Pediastrum Boryanum, ^. .169 



Figs. 33, 34. Pedia-strum pertusum, ..... 169 



Fig. 35. " " Var. brachylobum, . 170 



" 36. Pediastrum muticum, . . . 169 



" 37. Pediastrum angulosum, variety, . . 162 



