190 PRIMITIVE TYPES OF INTELLIGENCE 



MORGAN, C. L. Animal Behaviour, London, '00. 



SCHNEIDER, G. H. Der thierische Wille, '80. 



SPAULDING, E. G. An Establishment of Association in Hermit Crabs, 

 Eupagurus longicarpus. Jour. Comp. Neur. Psych. 14, 49, '04. 



UEXKULL, J. VON. Physiologische Untersuchungen an Eledone mos- 

 chata. Zeit. fur Biol. Vols. 28, 30, 31, '92-'95. 



WILLCOX, M. A. Homing of Fissurella and Siphonaria. Science, 

 n. s. 22, 90, '05. 



YERKES, R. M. Habit Formation in the Green Crab, Carcinus gran- 

 ulatus. Biol. Bull. 3, 241, '02. 



YERKES, R. M., AND HUGGINS, G. E. Habit Formation in the Craw- 

 fish, Cambarus affinis. Harvard Psych. Studies 1, 565, '03. 



YUNG, E. La psychologic de 1'escargot. C. r. et Trav. Soc. Helv. 

 Sci. Nat. '93, 127, 



