LIFE HISTORY OF DIDINIUM 239 



LITERATURE CITED 



Balbiani, E. G. 1873 Observations sur le Didinium nasutum. Arch. d. Zool. 

 Exper., torn. 2. 



VON Eklanger, R. 1889 Zur Kenntnis einiger Infusorien. Z. w. Z., Bd. 49. 



Fermor, X. 1913 Die Bedeutung der Encystierung bei Stylonychia pustulata 

 Ehr. Zool. Anz., Bd. 42, no. 8. 



Jennings, H. 1906 The behavior of the lower organisms. New York. 



Mast, S. O. The reactions of Didinium nasutum (Stein) with special reference 

 to the feeding habits and the function of trichocysts. Biol. Bull., 

 vol. 16, no. 3. 



Moody, J. E. 1912 Observations on the life-history of two rare ciliates, Spa- 

 thidium spathula and Actinobolus radians. Jour. Morph., vol. 23. 



Prandtl, H. 1906 Die Conjugation von Didinium nasutum. Arch. Prot., 

 Bd. 7. 



Thon, K. 1905 Uber die feineren Bau von Didinium nasutum. Arch. Prot., 

 Bd. 5. 



Woodruff, L. L., and Erdmann. R. 1914 A normal periodic reorganization 

 process without cell fusion in Paramecium. Jour. Exp. Zool., vol. 17. 



