490 Wisconsin Academy cf Sciences, Arts, and Letters. 



EXPLANATION OF PLATE XVI. 



Fig. 1. Diaptomus pallidus : fifth feet of male (X 190). 



Fig. 2. Diaptomus pallidus : abdomen of female (X 165). 



Fig. 3. Diaptomus 2^cillidus: fifth feet of female (X 290). 



Fig. 4. Diaptomus Bakert: abdomen of female (X 15f>). 



Fig. 5. Diaptomus Baker i: terminal segments of right antenna of male 



(X155). 

 Fig. 6. Diaptomus Bakeri: fifth feet of male (X 165). 

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

 Fig. 8. DiaptoTYius tenuicaudatus : fifth feet of male (X 290). 

 Fig. 9. Diaptomus Bakeri: fifth feet of female (X 29C). 



