558 D. D. WHITNEY 



Whitney, D.D. 1910 The influence of external conditions upon the life cycle of 

 Hydatina senta. Science, N. S., vol. 32, no. 819, September 9. 



1912 a Strains in Hydatina senta. Biol. Bull., vol. 22. 



1912 b Reinvigoration produced by cross-fertilization in Hydatina 

 senta. Jour. Exp. Zool., vol. 12. 



1912 c Weak parthenogenetic races of Hydatina senta subjected to a 

 varied environment. Biol. Bui., vol. 23. 



1913 An explanation of the non-production of fertilized eggs by adult 

 male-producing females in a species of Asplanchna. Biol. Bui., vol. 25. 



1914 The production of males and females controlled by food con- 

 ditions in Hydatina senta. Science, N. S., vol. 39, no. 1014, June 5, 

 l)p. 832-833. 



