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 Übersetzungsrecht vorbehalten. 



The sensory reactions of ïïolothuria surinamensis 



Ludwig. 



By 

 W. J. Crozier.i) 



(Contributions from the Zoological Laboratory of tlie Museum of 

 comparative Zoology at Harvard College, No. 251.) 



With 3 figures in the text. 



Contents. 



Page 



I. Introduction 234 



II. The species studied 235 



1. Anatomy 235 



2. Habitat and activities 237 



a) Habitat 237 



b) Temperature range 238 



c) Feeding 239 



d) Respiratory movements 239 



e) Locomotion 240 



f) Auto-evisceration 243 



g) Regeneration 246 



III. Mechanical stimulation 250 



1. Local mechanical stimuli 250 



a) The tentacles 250 



b) The podia 251 



1) Contributions from the Bermuda Biological Station for Research, 

 No. 33. 



16* 



