UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 18, No. 12, pp. 239-298, plates 9-11, 1 figure in text March 11, 1918 



DIFFERENTIALS IN BEHAVIOR OF THE TWO 



GENERATIONS OF SALPA DEMOCBATICA 



RELATIVE TO THE TEMPERATURE 



OF THE SEA 



BY 



ELLIS L. MICHAEL 



(Contribution from the Scripps Institution for Biological Research of the University of California) 



CONTENTS 



PAGE 

 Introduction 240 



A. Pieliminaiy 241 



1. Description of life cycle 241 



2. Crude data and method of procedure 246 



3. Brief discussion of seasonal distribution 250 



4. Brief discussion of vertical distribution 251 



B. Temperature and surface distribution 252 



1. Eelations revealed by data 252 



2. A morphological implication 256 



3. Evidence of the existence of protruding chains 258 



4. Implications regarding locomotion 261 



C. Ee-examination of data 262 



1. Relation between season and temperature 262 



2. Relation between position and temperature 265 



3. Ostwald's viscoeity theory 269 



D. Theory of locomotion 271 



1. Behavior of chains 271 



2. Deduced peculiarities in temperature relations 274 



3. Validity of the plankton concept 281 



E. Summary and conclusions 288 



F. Literature cited 291 



