MICHIGAN ACADEMY OP SCIENCE. 101 



Literature. 



Kofoid, C. A., 1900. Plankton studies. II. On Pleodorina illin- 

 oisensis, a new species from the plankton of the Illinois River. 

 Annals and Magazine of Natural History, Series 7, Vol. 6, July; 

 also Bulletin of the Illinois State Laboratory of Natural History, 

 Vol. V. (Includes a key for the identification of species.) 



Shaw, Walter R. 1894:. Pleodorina, a new genus of the Volvociuae. 

 Botanical Gazette, Vol. XIX. 



