496 Wisconsin Academy of Sciences, Arts, and Letters, 



EXPLANATION OP PLATE XIX. 



Fig. 1. Diaptomus Birgei: fifth foot of female (X 290). 



Fig. 2. Diaptomus Tyrelli: abdomen of female (X 156). 



Fig. 3. Diaptomus TyrelU: fifth feet of male (X 190)- 



Fig. 4. Diaptomus siciloides: terminal segments of right antenna of 



male (X 290). 

 Fig. 5, Diaptomus siciloides: fifth feet of male (X 190). 

 Fig. 6, Diaptomus Birgei: fifth feet of male (X 190). 

 Pig. 7. Diaptomus siciloides: abdomen of female (X 165). 

 Fig. 8. Diaptomus Tyrelli: fifth foot of female (X 290). 



