FRESH WATER ALG/€. 



PLATE V. 



lii-iril'Jir^i'i'irt^- 



T. aiNCtillR A SON. PMlLAOELJ»HIA 



Tf« NATUnE BV DR H C. W002 



Fig. 1. MASTIGONEMA ELONGATUM 

 ■• 2. MASTIGONEMA HALOS. 



Fig. 3. MASTIGOTHRIX FIBROSA. 

 ■' 4. SCYTONEMA RAVENELM. 

 " S. CHROOCOCCUS REFRACTUS. 



Fig. 6. CHROOCOCCUS MULTICOLOR- 

 ATUS. 



