133 



EXPLANATION OF FIGURES. 



Fig. 1. Diaptomus. Scale, one vertical space equals 100 individuals 

 per hundred liters of surface water. 



— August 5-6. 



- August 27-28. 



Fig. 2. Cyclops. Scale, one vertical space equals 50 individuals per 

 hundred liters of surface water. . 



August 5-6. 



- August 27-28. 



Fig. 3. DapJniia hyalina. Scale, one vertical space equals 50 individ- 

 uals per hundred liters of surface water. 



Adult. 1 



r August 0-6. 

 Young. J 



Fig. 4. DapJinia liyaUna. Scale, one vertical space equals 50 individ- 

 uals per hundred liters of surface water. 



Adult. ) 



\ August 27-28. 

 - Young, j 



