176 Kansas Academi/ of Science. 



PLATE IV. 



Fig. 27. Draparnaldia glomerata X 520 



Fig. 28. Stigeoclonium aestivale X 520 



Fig. 29. Cladophora glomerata X 375 



Fig. 30. (Edogonium irregulare X 300 



Fig. 30a. (Edogonium, small plant X 300 



Fig. 31. Melosira X 500 



Fig. 32. Encyonema X 600 



Fig. 33. Fragilaria X 500 



Fig. 34. Cymbella X 400 



Fig. 35. Pleurosigma X 



Fig. 36. Navicula X 



Fig. 37. Cocconeis X 



Pig. 38. Synedra X 



I 



