dark period be- ginning at 8 PM. FIGURE 1. Green species: A, Euglena spirogyra; B, Euglena viridis. FIG- URE 2. Green species: A, Phacus pusillus; B, Phacus
not so common as the above numbers. 7.Spirostomum, common everywhere. 8.Euglena, common everywhere. 9.Chilodon, common everywhere. 10.Trachelocerca, common