responsible for the emended description of the genus and for 
three of the four species now known (two are previously un- 
described). 
I am particularly indebted to my colleague, Professor E. N. 
Transeau, who has very graciously placed at my disposal all 
his notes on Oedogoniacee recorded during his long study of 
freshwater alge in the United States. He has offered many 
valuable suggestions during the fifteen years this study has 
been in progress. 
Leb t 
Department of Botany, The Ohio State University, 
Columbus, Ohio, January 2, 1930. 
10 
