502 Wisconsin Academy of Sciences, Arts, and Letters. 



EXPLANATION OP 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 x'ight antenna of male 



(X 290). 

 Fig. 5. Diaptomus w ashing toneu sis : fifth foot of female (X 290). 

 Fig. 6. Dia2ytomus Judayi: fifth feet of male (X290)- 

 Fig. 7. Diaptomus nudus : terminal segments of right antenna of male 



(X267). 

 Fig. 8. DiajHofnus ivashingtonensis : terminal segments of right antenna 



of male (X 290). 

 Fig. 9. DiajHoraus washingtonensis : fifth feet of male (X 190). 



