1 



FRESH WATER ALG>E. 



PLATE VI. 



AFTER NATURE BY DR.M.C WOOD 



T. 81N0I.AIR h SON, PHlLAOlLPHtA. 



Fig. 1. SCYTONEMA THERMALE. 

 " 2. S. CALLITRICHOIDES. 

 " 3. S. DUBIUM. 



Fig. 4. S. CORTEX. 

 " 6. CH,€TOPHORA ELEGANS. 



