ON THE CYCLOPIDiE AND CALANIDiE OF CENTRAL 
WISCONSIN. 
By C. Dwight Marsh. 
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 Green 
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 
materia] 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 
15—A. & L. 
