Species and Varieties Known to Exist in Wisconsin. 283 
Several species were not found north of central Wisconsin: 
Scapholeberis aurita , Fisch. 
Pleuroxus exiguus, Lillj. 
Dunhevedia setiger , Birge. 
Alona quadrangularis , O. F. M. 
Without doubt the range of many of these will be extended by 
further study. A striking example occurred just as this paper 
was going to press. Macrothrix rosea , Jur. was not found in 
northern Wisconsin, although abundant in the centre of the 
state and although it was especially sought. Finally a single 
specimen was found in a pelagic collection from Bayfield at the 
extreme north of the state 
A considerable number of species have been found in southern 
Wisconsin, whose range has not as yet been extended to the 
northern part of the state. These are: 
Moina affinis , Birge. 
Moina flagellata , Hudendorff. 
Ceriodaphnia megalops , Sars. 
Scapholeberis obtusa , Schdl. 
Daphnia pulex , De G-eer. 
Daphnia microcephala , Sars. 
Daphnia longiremis , Sars. 
Ilyocryptus sordidus , Liev. 
Bosmina longicornis , Schdl. 
Bosmina bohemica , Hellich. 
Leydigia quadrangularis , Leyd. 
Alona tenuicaudis , Sars. 
Alonopsis latissima , var. media , Birge. 
Camptocercus macrurus , O. F. M. 
Camptocercus biserratus,. Schdl. 
Adding these to the former list we have a total of eighty- 
four species and varieties - known to exist in Wisconsin. Of 
these varieties it may be said that nearly all of them are recog¬ 
nized as species in standard lists of European Cladocera and in 
comparing the fauna of Wisconsin with that of any other country, 
most of them must be counted as species. 
