490 Wisconsin Academy cf Sciences, Arts , and Letters. 
EXPLANATION OF PLATE XVI. 
Fig. 1. Diaptomus paUidus : fifth feet of male (X 190)* 
Fig. 2. Diaptomus paUidus: abdomen of female (X 165). 
Fig. 3. Diaptomus pallidus : fifth feet of female (X 290). 
Fig. 4. Diaptomus Bakem: abdomen of female (X 155). 
Fig. 5. Diaptomus Bakeri: terminal segments of right antenna of male 
(X155). 
Fig. 6. Diaptomus Bakeri: fifth feet of male (X165). 
Fig. 7. Diaptomus tenuicaudatus : abdomen of female (X 165). 
Fig. 8. Diaptomus tenuicaudatus : fifth feet of male (X 290). 
Fig. 9. Diaptomus Bakeri: fifth feet of female (X 29C). 
