FRESH WATER ALG-t 



PLATE IV. 





W A' 



.<*'' . fi ''& 

 * > *^ 

 v y..% i 



f Tl it : ,*1 . .. 



F.|. 1. MASTIGONEM* FERTILE. 

 - 1 MAST1GONEMA SEJUNCTUM 



F. ( 3 ZONOTRICHA MOLL'S 

 - 4 ZONOTMICHA PAMCEZONATA 



fig. 6. OASVACTIS MOLL'S. 

 * t CCXLOSPH/CRIUM DUBIUM. 



