author's abstract of this paper issued 

 by the bibliographic service, august 11 



SENSORY REACTIONS OF CHROMODORIS ZEBRA^ 



W. J. CROZIER 



Bermuda Biological Station 



LESLIE B. AREY 



Northwestern Universitij Medical School 



EIGHT FIGURES 



CONTENTS 



I. Introductory 261 



II. Mechanical excitation 267 



1. Tactile stimulation 267 



2. Righting ; geotropism 275 



3. Rheotropism 278 



4. Nervous relations 282 



III. Photic excitation 288 



1. Light 288 



2. Shading 292 



3. Discussion 295 



IV. Thermal excitation 296 



V. Chemical excitation 301 



VI. Summary 307 



Literature cited 308 



I. INTRODUCTORY 



With the objects of presenting data valuable for the compara- 

 tive study of 'animal behavior' and of laying a foundation for 

 the intelligent pursuit of certain inquiries in sensory physiology, 

 this article aims to record and briefly to discuss some aspects 

 of the sensory responses of the nudibranch Chromodoris zebra 

 Heilprin.2 In 1884 Bergh wrote that almost nothing was known 



1 Contributions from the Bermuda Biological Station for Research, no. Ill, 

 and from the Anatomical Laboratory of the Northwestern University Medical 

 School, no. 68. 



- Data upon which this paper is based were in part secured by L. B. A. dur- 

 ing the summer of 1914. These observations have been extended and the paper 

 written by W, J. C. 



261 



