286 
Birge—Notes on Cladocera. 
I. 
II. 
III. 
Holopediidm. 
1 
0 
0 
Sididse. 
4 
1 
0 
Daphniidse. 
16 
4 
4 
Macrothricidm. 
8 
1 
0 
Bosmi'nidae. 
4 
0 
0 
Lynceidse. 
29 
7 
2 
1 
0 
0 
Leptodoridse. 
1 
0 
0 
Total. 
64 
13 
6 
Besides these enumerated in the table, one species, Ilyocryptus 
lonyiremis, Sars, is common to Wisconsin and Australia. It is 
possible that the forms described in the second section of this 
paper under the names D. microcephalcc and D. lonyiremis , Sars, 
are really entitled to rank as independent varieties. If so the 
totals must be correspondingly altered. It is also to be ob¬ 
served that Imhof has noted * but not described a new species 
of Bosmina from Green lake, Wisconsin. 
The facies of our fauna is even more European than these fig¬ 
ures would indicate. American varieties of European species 
need, of course, no comment. They are only slightly dif¬ 
ferent from the European form. The like may be said of 
m'any of the Wisconsin forms considered as entitled to specific 
rank. Many of them are very close to European species, as may 
be seen from the following list: 
*Zoologischer Anzeiger, vol xiv, p. 275. 
