44 HENRY H. P. SEVERIN AND HARRY C. SEVERIN 



25. Slater, F. W. The Egg-Carrying Habit of Zaitha. Amer. Nat., XXXIII, 



1899. pp. 931-3. 



26. Stockard, C. R. Habits, Reactions, and Mating Instincts of the Walking- 



1908. Stick, Aplopus mayeri. Publ. No. 103, Carnegie Inst., Wash- 

 ington, pp. 43-59. 



27. Verworn, M. Beitrage zur Physiologic des Centralnervensystems. Erster 



1898. . Theil. Die sogenannte Hypnose der Thiere. Jena, pp. 1-92. 



28. Weed, C. M. Article II. Studies in Pond Life. Bull. Agr. Exp. Sta., Tech. 



1889. Series, I, pp. 4-17. 



