502 Wisconsin Academy of Sciences, Arts, and Letters . 
EXPLANATION OF PLATE XXII. 
Fig. 1. Diaptomus nudus: fifth feet of male (X 158). 
Fig. 2. Diaptomus nudus: abdomen of female (X 158). 
Fig. 3. Diaptomus signicauda: fifth feet of male (X 290). 
Fig. 4. Diaptomus Judayi: terminal segments of right antenna of male 
(X 290). 
Fig. 5. Diaptomus washing tonev sis: fifth foot of female (X 290). 
Fig. 6. Diaptomus Judayi: fifth feet of male (X290). 
Fig. 7. Diaptomus nudus: terminal segments of right antenna of male 
(X 267). 
Fig. 8. Diaptomus washingtonensis: terminal segments of right antenna 
of male (X 2S0). 
Fig. 9. Diaptomus washingtonensis: fifth feet of male (X 190). 
