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: 



Holopediidae . . 



Sididae 



Daphniidas 

 Macrothricidse 

 Bosminidae . . . , 



Lynceidae 



Polyphemidae. . 

 Leptodoridae . . 



Total 



00 

 00 



^3 



CD hj 

 O 



pq 



1 

 4 



39 

 8 

 5 



37 

 1 

 1 



GO 

 GO 

 GO 





ID 

 GO 



yj CO 



CD 



P 



1 



3 

 36 

 6 

 5 

 47 

 1 

 1 



96 



100 



1 

 4 



19 

 6 

 7 



31 

 6 

 1 



o 



Ci 

 GO 



o 



1 



5 



24* 

 11 

 15 

 40 



75 



105 



CO 

 CO 



o rn 



1 



5 

 24 



10 



4f 

 38 



1 



1 



84 



* Besides numerous varieties. 



| 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 



