554 Wisconsin Academy of Sciences, Arts, and Letters. 
rotifer work was established by de Beauchamp when he published 
his Recherches sur les Rotiferes in 1909, which suddenly made the 
earlier literature on the group all but worthless. We are endea¬ 
voring as far as possible to follow the path which he has pointed 
out in the re-description of the central group of the Notommatid 
rotifers which follows the list of described species so far found in 
Wisconsin. When preparations were begun for this paper we 
planned to include all the genera of Notommatids, but the under¬ 
taking proved even more laborious and time-consuming than we 
had anticipated, and the number of plates required is so large 
that it was decided to divide the paper into two parts, of which 
this is the first instalment. 
List of the Rotifers of Wisconsin 
Order PLOIMA 
Notommata aurita (Muller). 
Notommata cerberus (Gossee). 
Notommata collaris Ehrenberg. 
Notommata contorta (Stokes). 
Notommata copeus Ehrenberg. 
Notommata cyrtopus Gosse. 
Notommata galena new species. 
Notommata lenis new species. 
Notommata pachyura (Gosse). 
Notommata peridia new species. 
Notommata pseudocerberus de Beauchamp. 
Notommata saccigera Ehrenberg. 
Notommata silpfia (Gosse). 
Notommata tripus Ehrenberg. 
Notommata trypeta new species. 
Proales decipiens (Ehrenberg). 
Proales sordida Gosse. 
Proales parasita (Ehrenberg). 
Pleurotroeha petromyzon (Ehrenberg). 
Proalinopsis caudatus (Collins). 
Drilophaga judayi new species. 
Taphrocampa annulosa Gosse. 
Taphrocampa selenura Gosse. 
Lindia Candida new species. 
Lindia fulva new species. 
Lindia pallida new species. 
Lindia truncata (Jennings). 
Tetrasiphon hydrocora Ehrenberg. 
