64 



Maximum number Average Percentage 



in any in of 



Diatoms— one sample. all samples, occurrence. 



Asteriouella 8,700 271.8 GO 



Cyclotella 2,500 129.5 50 



Diatoma GOO 10.9 30 



Navicula 8,100 108.G 75 



Syuedra 135,400 18,766.6 100 



Piuularia 200 .3.8 25 



Cocooiieis GOO 15.4 25 



Gomphonema 100 0.9 5 



Meridion 100 0.9 5 



Cocfonema 300 8.1 20 



Melosii-ii 4,200 47.2 10 



Fragllaria 300 4.4 15 



Nitzschia 50 0.4 5 



Tabellaria 50 0.7 10 



Algae— 



Chaetophuru 100 5 5 



Oedogonium 100 5 10 



Kapliidium 50 0.4 5 



Protococcus 100 5 5 



Sceuedesmus 2,800 671.4 20 



Fungi— 



Creuotbrix 4,400 IOG.4 35 



Beggiatoa 1,200 90 10 



Infusoria— 



Dinobryon G4,000 6,546.6 90 



Peridinium 28,900 1,031.8 50 



UrogleiiJi 800 75.3 25 



Rotatoria— 



Anurea .KM* 12G 25 



Polyartbra KK) 5 5 



Crustacea- 

 Cyclops 10 0.6 15 



.Total number of species represented, 27. 



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

 and Dinobryon. 



