Where Collections tvere Made. 277 



The most important collection of the excursion was made at 

 Minocqua in lake Kawaquesaga. This is a very irregular sheet 

 of water, whose numerous shallow bays are filled with an 

 abundant growth of Utricularia and other water plants. Its 

 depth is not over thirty feet in any place which I visited. 

 Thirty-nine species of Cladocera were found here, the most re- 

 markable being the new species, Bunops scutifrons and Chydo- 

 rus faviformis. Here, too, Acantholeberis curvirostris and 

 Streblocerus serricaudatus were found for the first time. 



The other lakes examined in northern Wisconsin were Julia, 

 Tomahawk, Twin, and Pioneer. They are much alike in 

 character. They are twenty to thirty feet deep, rather 

 regular in outline, at least in the parts visited. The bottom 

 is sandy, the shore abrupt with little marsh and few water 

 plants. Rushes grow in the shallower parts but usually 

 spring from the sand, so that the conditions are not the best for a 

 large variety of Cladocera. Holopedium gibberum was found in 

 only one of these lakes, lake Julia at Rhinelander. Leptodora 

 hyalina did not occur at all, although it was looked for. The 

 species has however been found in the same region at Waters- 

 meet, Mich., so that no conclusion as to its distribution can be 

 drawn from its absence in these cases. 



Gogebic lake, Michigan, is a large lake about fourteen miles long 

 and two to three in width. It is shallow, being only about twenty- 

 two feet deep at the southern end which was the part I visited. 

 Into this end the Slate river flows and there is an abundant 

 growth of weed. There are many littoral species, and as the 

 lake is so long and so much exposed to the wind, the pelagic 

 species are mingled with the littoral fauna. Here was found a 

 remarkable variety of D. hyalina, whose crest resembles greatly 

 that of D. intexta, Forbes. In this lake were found the rare 

 forms, Anchistropus minor, Birge, Chydorus ruyulosus, Forbes, 

 Chydorus faviformis, Birge. 



Pelagic collections were made at Ashland and Bayfield, Wis. 

 Nothing of especial interest was found except Holopedium gib- 

 berum at Bayfield and a single specimen of Macrothrix rosea at 

 the same place. 



