Baker—The Fauna of The Lake Winnebago Region, 141 
Table 1. This table shows the average number of individuals per square 
meter in the bottom fauna of Lake Winnebago, Lake Butte des Morts and the 
Fox River at Omro in the summer of 1920. The bottom has been divided into 
areas according to depth and character as indicated in the headings of the 
different columns. 
Organism 
Lake Winnebago 
Lake Butte 
des Morts 
Fox 
River, 
Omro 
Boulder, 
0.5-1.5 m. 
Gravel, 
0.3-1.5 m. 
Sand, 
0.3-0.9 m. 
Mud, 
0.3-1.5 m. 
Vegetation, 
0.3-1.6 m. 
Sand, 
Gravel, 
Mud, 
0.6-0.6 m. 
Sand, 
Mud 
Vegetation 
0.5-0.3 m. 
Mollusca 
4.93 
7.51 
2.57 
1.92 
1.33 
1.24 
4.76 
1.28 
1.92 
1.24 
L. recta . 
2.71 
.93 
P. alia . 
3.42 
1.28 
.93 
.62 
3.28 
P. gracilis . 
1.64 
P. g. lacustris . 
6.13 
2.88 
1.33 
1.24 
A. ligamentina . 
.62 
1.64 
A. elegans . 
1.64 
A. elegans, var. 
1.33 
.62 
F. fiava . 
1.64 
F. f. 'parvula . 
2.71 
1.28 
.66 
A. costata . 
.62 
1.64 
E. dilatatus . 
3.28 
E. d. sterhii . 
3.42 
1.28 
1.99 
.62 
L. costata, var . 
.66 
S. rugosus . 
3.28 
S. rugosus, var . 
3.42 
1.24 
A. g. gigantea . 
1.64 
A. g. footiana . 
5.46 
2.57 
.93 
.62 
A. itnbedUis . 
1.64 
D. triquetra. . 
1.64 
S. sulcatum . 
.66 
8.91 
6.22 
S, s. planatum . 
4.83 
.66 
S. solidulum . 
.66 
6.53 
1.92 
1.33 
3.73 
S. stamienum . 
.93 
3.28 
8. straUinum ... 
10.61 
.66 
26.88 
485.28 
8. lilycashense . 
1,64 
8. ohioense. . 
12.30 
. 
