BEHAVIOR IN LOWER METAZOA 259 



We shall attempt to analyze some of these matters farther in our general 

 discussion of behavior, which forms the remainder of the work. 



LITERATURE XII 



A. Behavior of echinoderms : Uexkull, 1897, 1897 a, 1899, igoo, igoo a; 

 Preyer, 1886; Romanes, 1885. 



B. Behavior of planarians : Pearl, 1903 ; Mast, 1903. 



C. Behavior of Rotifera : Jennings, 1904 b. 



D. Reaction by varied movements in other invertebrates : Smith, 1902 ; Holmes, 

 igoj ; BoHN, igo3 ; Moebius, 1873; Harper, 1905. 



E. Method of trial and error in vertebrates : Thorndike, 1898 ; Morgan, 1900. 



F. Modifiability of behavior in lower animals : Bohn, 1903 a, 1905 ; Gamble 

 AND Keeble, 1903 ; Jennings, 1904 d ; Yerkes, 1902 ; Yerkes and Huggins, 

 1903 ; Spaulding, 1904. 



