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FRESH WATER ALG>E. 



PLATE X. 



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T. SINOLAIfi fc SON, PHILADELPHIA 



AFTER NATUfiE BY DH. H, C. WOOD 



Fig. 1. SIROSIPHON PULVINATUS 

 " 2. PLEUROCOCCUS SERIATUS 



Fig ■:!. PALMELLA JESSENl.l. 



Fig 4. BOTRYOCOCCUS PULCHELLUS, 

 ■• S. PALMELLA DURA. 



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