FRESH WATER ALG^ 



PLATE II. 



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AFTER rtATURE B." DB H C WOCO 



F.g. 1. SCENEDESMUS POLYMORPHUS. 

 ■' 2. SCENEDESMUS QUADRICAUOA 



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F.g, 3. SCENEDESMUS ROTUNDATUS 

 4. PALMOGLOEA CLEPSYDRA. 

 •■ 5. COSMARIUM ACEROSUM. 



E.g. 6. COSMARIUM AREOLATUM. 

 • 7. COSMARIUM VENUS. 



