496 Wisconsin Academy of Sciences, Arts, and Letters . 
EXPLANATION OF PLATE XIX. 
Fig. 1. Diaptomus Birgei: fifth foot of female (X 290). 
Fig. 2. Diaptomus Tyrelli: abdomen of female (X 156). 
Fig. 3. Diaptomus Tyrelbi: 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). 
Fig. 7. Diaptomus siciloides: abdomen of female (X 165). 
Fig. 8. Diaptomus Tyrelli: fifth foot of female (X 290). 
