192 Wisconsin Academy of Sciences, Arts, and Letters. 
Table 2. Showing average infection hy months in the Yahara Biver laTces, 
1917-1918. After October, perch were not examined from any lake except 
Mendota, with the exception of seven specimens from Kegonsa in November. 
Month 
1 Number examined || 
Dipiostomum cuticola 
Bunodera luciopercae 
Clinostomum cysts; 
skin, gills 
Echinorhynchus 
thecaius 
Neoechinorhynchus 
cylindratus 
Acanthocephalan 
cysts, visceral 
Dacnitoides cotylophora 
Icthyonema cysts, 
visceral 
Proteocephalids, 
intestinal 
Proteocephalid cysts, 
visceral 
Bothriocephalus 
cuspidatus 
Glochidia, gills 
Pisdcolaria 
Unknown 
visceral cysts 
Total 
Jnnpi 
45 
5.1 
+ 
1.0 
0.2 
6.2 
0.2 
2.1 
0.4 
15.2 
July. 
79 
11.5 
+ 
0.2 
1.0 
1.3 
0.7 
0.1 
7.9 
+ 
2.1 
+ 
0. 
525.3 
August. 
62 
8.9 
1.2 
0.1 
0.3 
0.1 
1.5 
0.4 
5.5 
0.1 
0.4 
18 5 
September... 
56 
6.4 
0.1 
+ 
+ 
+ 
2.2 
0.7 
2. 
8 0. 
8 3.2 
0.8 
0.1 
1.2 
18.2 
October. 
31 
6.3 
2.0 
0.3 
0.3 
0.3 
4.3 
0.3 
3.3 
0.2 
+ 
0.7 
18.0 
November... 
13 
19.1 
1.0 
0.2 
0.2 
4.7 
13.8 
39.0 
.Taniinry 
20 
4.5 
1.8 
23.7 
0.3 
21.5 
2.1 
0.9 
3.5 
0.1 
1.3 
59.7 
February.... 
10 
0.5 
0.9 
5.3 
2.8 
2.0 
0.3 
11.0 
0.4 
23.2 
March. 
20 
0.4 
3.1 
18.4 
17.6 
1.5 
0.5 
3.6 
45.1 
April. 
7 
0.1 
3.7 
7.5 
9.1 
114.6 
1.3 
0.7 
137.0 
May. 
8 
1.5 
2.7 
0.1 
29.4 
76.3 
5.4 
0.3 
1.6 
0.1 
117.4 
Total. 
64.3 
16.5 
0.2 
8.1 
86.2 
215.4 
24.9 
26.5 
3.6 
60.3 
1.4 
4.2 
0.2 
4.9 
516.6 
Average... 
5.8 
1.5 
+ 
0.7 
7.8 
19.6 
2.3 
2.4 
0.3 
5.5 
0.1 
0.4 
+ 
0.4 
46.8 
