64 



Maximum number Average Percentage 



in any in of 



Diatoms— one sample. all samples, occurrence. 



Asterionella 8,700 271.8 60 



Cyclotella 2,500 129.5 50 



Diatoma 600 10.9 30 



Navicula 3,100 108.6 75 



Synedra 135,400 18,766.6 100 



Pinularia 200 3.8 25 



Cocconeis 600 15.4 25 



Gomplionema 100 0.9 5 



Meridion 100 0.9 5 



Cocconema 300 8.1 20 



Melosira 4,200 47.2 10 



Fragilaria 300 4.4 15 



Nitzschia 50 0.4 5 



Tabellaria 50 0.7 10 



Algae— 



Chaetopliora 100 5 5 



Oedogonium 100 5 10 



RaphidiUDi 50 0.4 5 



Protococcus 100 5 5 



Scenedesmus 2,800 671.4 20 



Fungi— 



Orenothrix 4,400 106.4 35 



Beggiatoa 1,200 90 10 



Infusoria— 



Dinobryon 64,000 6,546.6 90 



Peridinium 28,900 1,031.8 50 



Urogleun 800 75.3 25 



Rotatoria — 



Anurea 500 126 25 



Polyarthra 100 5 5 



Crustacea- 

 Cyclops 10 0.6 15 



Total number of species represented. 27. 



Particular attention is called to the three forms, Uroglena, Asterionella 

 and Dinobiyon. 



