276 Birge — Notes on Cladocera. 



lake Julia and in marshes ; lakes Tomahawk and Kawaquesaga in 

 Oneida county, Pioneer and Twin lakes in Forest county, and 

 Ashland and Bayfield harbors on Lake Superior. Mr. Cheney coll- 

 ected in lake Vieux Desert on the line between Michigan and 

 "Wisconsin, and I have visited lake Gogebic in Michigan and 

 have received material collected at Watersmeet by Prof. C. 

 R. Barnes. 



Collections were also made at numerous other points in north- 

 ern Wisconsin, among them G-oodnow, Harshaw, Hixon and 

 Tomahawk on the Valley Division of the CM. & St. P. R. R., 

 Lac du Flambeau, Woodruff and Bolton on the M. L. S. & W. 

 R. R., but they did not show any species not included in the 

 lists from the lakes where more careful work was done. 



The lakes in which I collected differ considerably in charac- 

 ter. Lake Winnebago is a large sheet of water, -about thirty 

 miles long by fourteen in width. It is very shallow — nowhere 

 over twenty to twenty-five feet deep. At the place where my 

 collection was made — about eight miles north of Oshkosh — the 

 lake yielded a great amount of pelagic material and but little 

 from the shore waters. Anchistropiis minor is the only rare 

 species found* here. Lake Butte des Morts was visited only at 

 the end nearest Oshkosh. The collection from this lake as well 

 as that from lake Winnebago can not represent their fauna at 

 all adequately. 



Green lake near Ripon has been thoroughly studied by Prof. 

 C. Dwight Marsh so far as its pelagic Copepoda are concerned. 

 Its physical characters are described by him in a paper pub- 

 lished in the Transactions of this Academy, vol. VIII, p. 214. 

 The lake is over 200 feet in depth. It afforded very few pe- 

 culiar forms. Pleuroxus nanus was found here and this is the 

 furthest point to the south at which it has been found. If 

 further study shows this species to have a wider southern 

 range, the Cladoceran fauna of the lake will not differ from 

 that of the shallower lakes in the same region. 



Collections were made at Necedah and New Lisbon from 

 streams, ponds and marshes. Latonopsis australis was found 

 at the former place, the only locality where it has been found out- 

 side of Madison. 



