NOTES ON CLADOCERA. TIL* 



By E. A. Birge, Professor of Zoology, University of Wisconsin. 



A. On a Collection of Cladocera from Central and Northern 

 Wisconsin and Northern Michigan. 



In the summer of 1892, I made a short collecting trip through 

 central and northern Wisconsin, occupying the last days of 

 July and the first of August. Earlier in the same season I 

 visited Green lake and made collections supplementing the 

 pelagic material kindly given me by Prof. C. Dwight Marsh, of 

 Ripon College, Wis. In August, 1893, I collected Cladocera in 

 Washington .Harbor, Isle Royale, Michigan, and in G-ogebic 

 lake, Mich. During the same season Mr. L. S. Cheney, of the 

 University of Wisconsin, collected for me in northern Wiscon- 

 sin, but his material, except that from lake Vieux* Desert, has 

 not yet been thoroughly studied. 



My thanks are due to Hon. Philo Dunning, the former 

 president of the Wisconsin Fish Commission, and to G-en. E. 

 E. Bryant, its present head, for securing me free transporta- 

 tion on these excursions; and to the officials of the Chicago, 

 Milwaukee & St. Paul Railroad, and of the Milwaukee, Lake 

 Shore & Western Railroad for transportation furnished. 



The central Wisconsin collections were made from lakes 

 Winnebago, Butte des Morts and Green, and also from ponds 

 and marshes at Necedah and New Lisbon. Pelagic material has 

 also been given me by Prof. Marsh from lakes Puckaway, Buf- 

 falo and Rush, but this, so far as examined, has shown little of 

 interest. 



In northern Wisconsin I visited Rhinelander, collecting in 



* The preceding articles of this series were published in the Transac- 

 tions of this Academy, vol. IV, 1878, and vol. VIII, 1891. 



