ON THE CYCLOPIM: AND CALANID.E OF CENTRAL 



WISCONSIN. 



By C. Dwight Maesh. 



The material on which this paper is based has been largely 

 collected from the immediate vicinity of Ripon. The fauna of 

 Green Lake I have been enabled to study with considerable 

 thoroughness ; I have not only made a large number of collec- 

 tions, but they have been made at all seasons from early spring 

 to December, and the work has extended over several years. 

 From some ponds in the neighborhood of Ripon, I have made 

 similar repeated collections. From Lake Puckaway, Lake 

 Winnebago, and the smaller lakes in Fond du Lac and G-reen 

 Lake counties, my collections were for the most part made in 

 the months of July and August. 



Through the kindness of Prof. E. A. Birge, I have also had 

 material collected by him from lakes in the northern part of 

 the state, and by Miss H. Merrill from the Great Lakes. 



This is not presented as a final report, for I still feel very 

 doubtful in regard to the relationships of some species. But 

 to properly define these relationships seems likely to involve a 

 long period of study, and possibly it cannot be done satisfac- 

 torily until more is known of the embryonic and larval stages. 

 Inasmuch as so little has been published in regard to Ameri- 

 can copepoda, I may be justified in publishing this paper, 

 although I am well aware of its imperfections. 



While faunistic studies of fresh-water Crustacea have been 

 quite thoroughly prosecuted in Europe, and to some extent in 

 Asia and Africa, only a few localities in the United States 

 have been studied with any degree of thoroughness. The only 

 considerable publications on copepoda have been made by 

 Prof. Forbes, Prof. Cragin and Prof. Herrick. Prof. Forbes, 

 who has made very important additions to our knowledge of 

 1?-A. & L. 



