284 
Birge—Notes on Cladocera. 
The list of Wisconsin forms has now become so great that it 
is not premature to compare our fauna with that of European 
countries. The following table will show the number of species 
reported from various countries as compared with the Wisconsin 
list: 
' 
Bohemia, 
Hellich, 1878, 
00 
00 
00 
r—1 
2 
M 
Denmark. 
Mulbe, 1867. 
Norway. 
Sars, 1890. 
Wisconsin. 
Birge, 1893. 
Holopediidae.. 
1 
1 
1 
1 
1 
Sididse. 
4 
3 
4 
5 
5 
Daphniidse. 
39 
36 
19 
24* 
24 
Macrothricidse.. 
.8 
6 
6 
11 
10 
Bosminidee. 
5 
5 
7 
15 
4t 
Lynceidse.. 
37 
47 
31 
40 
38 
Polyphemidse. 
1 
1 
6 
8 
1 
Leptodoridse. 
1 
1 
1 
1 
1 
Total... 
96 
100 
75 
105 
84 
* Besides numerous varieties, 
j* And several undetermined species. 
In comparing the above lists the fact must be noted that 
Hellich’s list for Bohemia and Daday’s for Hungary both con¬ 
tain a large number of species of the genus Daphnia. Hellich 
gives twenty-four species of this genus and Daday enumerates 
eighteen. Many of these are of doubtful value. A certain por¬ 
tion of them can be fairly set against the varieties of that 
genus included in my total. But after making all deductions 
