lUTHORS ABSTRACT OF THIS PAPER ISSUED 

 iY THE BIBLIOGRAPHIC SERVICE, AUGUST 11 



THE SENSORY RESPONSES OF CHITON ^ 



LESLIE B. AREY 



Northwestern University Medical School 



AND 



W. J. CROZIER 



Bermuda Biological Station 



FOURTEEN FIGURES 



CONTENTS 



I. Introduction 158 



II. Natural history 160 



1. Habitat and appearance 160 



2. Growth and duration of life 169 



3. Destructive agents 170 



4. Feeding 172 



5. Respiration 173 



6. Migrations ; association in groups 175 



7. Breeding habits 179 



S. Bionomic correlations 181 



III. Movements and reactions 182 



1. Local movements 183 



2. Movements of the animal as a whole 185 



3. Locomotion 187 



IV. Mechanical excitation 192 



1 . Tactile stimulation 192 



A. Dorsal surface 193 



B. Ventral parts 194 



C. Distribution of sensitivity 198 



D. Tactile receptors 200 



2. Vibratory stimuli 202 



3. Thigmotaxis 204 



4. Rheotropism 206 



5. Geotropism 207 



6. Summary 210 



1 Contributions from the Bermuda Biological Station for Research, no. 110, 

 ■and from the Anatomical Laboratory of the Northwestern University Medical 

 .School, no. 66. 



157 



