Baker—The Fauna of The Lake Winnebago Region. 129' 
Associated animals a little more than equal the mollusks in 
abundance. They include a number of genera divided among 
fourteen higher groups. Two groups make up 65 per cent of the 
total, Hyalella, 43 per cent and Chironomid larvae 22 per cent. 
Caenis occurred at 2 and 3.4 meters and Hexagenia was found on 
a mud bottom in 1 to 3.4 meters. Enallagma and Anax junius 
were included among Odonata, both rare. Nymphula was rare at 
all but one station. Plea striola, adult and nymph, was not un¬ 
common. Trichoptera included Agraylea, Leptocella, Helico- 
psyche, Molanna, and Polycentropidae, which were not found 
deeper than 1.5 meters. Among Coleoptera, Bidessus flavicollis, 
Stenelmus hicarimatus, Donacia proxima, and a Dascyllid larva 
occurred uncommonly in shallow water (1 meter) excepting 
Donacia which was found at 3 meters. The mites were very rare 
and included Hydrachna, Limnesiopsis, and Unionicola, mostly in¬ 
habitants of shallow water. Pour species of leeches occurred in 
the deepest water on mud and sand bottom, Glossiphonia stagnalis,. 
nepheloidea, fusca, Erpohdella punctata. 
The vegetation population of this lake is large but not particu¬ 
larly varied. Only thirteen species of mollusks, of which Bythinia,, 
Amnicola limosa, and Ferrissia parallela form about 79 per cent,, 
were collected from plants as compared with 25 species in Lake 
Winnebago. 
Among associated animals, Hyalella and Chironomid larvae 
make up 56 and 36 per cent respectively, but are otherwise poorly 
represented. At one station (93) the filamentous algae were fairly 
alive with Hyalella and Chironomid larvae. The genera repre¬ 
sented in the vegetation include Plea striola and Belostoma 
nymphs; Hexagenia nymphs; Enallagma nymph; Agraylea, Heli- 
copsyche, Leptoceridae larvae; Nymphula larva; Donacia proxima^ 
Bidessus fiavicollis, B. affinis, Dytiscid larva; Hydracna, Lim- 
nesia; Asellus intermedius; Plumatella polymorpha; Hydra oligac- 
tis, and Glossiphonia and Erpobdella. 
Fox River (Table 1). 
Dredgings were made near Omro, the maximum depth found be¬ 
ing 2.9 meters. The bottom is of mud, sand, clay, or gravel, mud 
occurring in all protected places. Gravel occurred near Omro in 
water 2.9 meters deep in which three species of Naiades were 
found. The shores of the river are swampy for the most part, low,. 
