FRESH WATER ALG> 



PLATE v. 



' MB* * D* H c WOOO 



Fi ( . 1. MASTIGONEM* ELONGATUM 

 - X. MASTIGONEM* HALOS. 



Flf. 3. MASTIGOTHRIX FI8ROSA. 



- 4. SCYTONEMA RAVENELH. 



- . CMROOCOCCUS REFRACTUS. 



Fig. 6. CHROOCOCCUS MULTICOLOR- 

 ATUS. 



