North American Fresh-water Cyclopidce. 65 



VI. Subgenus Eucyclops Claus. 



15. Cyclops serrulatus Fischer. 

 Very common everywhere. 



16. Cyclops prasinus Fischer. 



Abundant in all sorts of waters in the Mississippi Valley, 

 Massachusetts, and Florida. 



VII. Subgenus Paracyclops Claus. 



17. Cyclops phaleratus Koch. 



A rare species in Manitoba, Massachusetts, Alabama, and 

 the north central States. 



18. Cyclops Jimbriat us var. poppei Rehberg. 



A rare species in Manitoba, Alabama, and the north central 

 States. 



19. Cyclops ajjinis Sa,vs,Jide Herrick. 



If this form occurs in America it is very rare, and limited 

 in its distribution. 



