1 



FRESH WATER ALG^ 



PLATE III. 



> .' I / ' 



AFTM NATOBC BV DB. M. C. WOOD. 





I 





1 '^^ 



/ 



y 



5d 



4b 



X 



4a 



•2» 





f^5^ 



5ci 



5a 



5^1! 



T. SINCLAIR ft SON. PH'U* OtUPHIA. 



Fig. 1. CYLINDROSPERMUM FLEXUO- j Fig. 3. S POLYSPERMA. 



SUM 

 2. SPH/EROZYGA SUBRIGIDA. 



4. GUOIOTRICHA INCRUSTATA 



Fig. y CHLOROCOCCUS. 

 " e. NOSTOCHOPSIS LOBATUS. 

 •■ 7, PR0T0C0CCU5, 



