1116 Wisconsin Academy of Sciences, Arts, and Letters. 



EXPLANATION OF PLATE LXXII. 



Fig. 1. Cyclops ater; fourth swimming foot (x 120). 



Fig. 2. Cyclops ater; abdomen of female (x 103). 



Fig. 3. Cyclops ater; fifth foot (x 340). 



Fig. 4. Cyclops ater; eleventh to fourteenth antennal segments of fe- 

 male (x 425). 

 Fig. 5. Cyclops ater; receptaculum seminis (x 321). 

 Fig. 6. Cyclops ater; antennule of female (x 103). 

 Fig. 7. Cyclops viridis var. americanus ; fifth foot (x 340). 

 Fig. 8. Cyclops viridis var. parens; fifth foot (x 340). 

 Fig. 9. Cyclops ater; last three segments of female antenna (x 212). 



