UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



VoL 18, No. 14, pp. 337-396, plates 14-16 



September 7, 1918 



THE NEUROMOTOR APPARATUS OF 

 EUPLOTES PATELLA 



BY 



HARRY B. YOCOM 



CONTENTS 



PAGE 



Introduction 338 



Acknowledgments 340 



Technique 341 



Culture 341 



Methods of preparation 341 



Structure 344 



External features 344 



Internal features 348 



Ectoplasm 348 



Endoplasm 349 



Food vacuoles 349 



Contractile vacuole 350 



Nuclear structure 350 



Macronucleus , 350 



Micronucleus 351 



Motor organs and neuromotor apparatus 351 



Structure of cirri 352 



Structure of membranelles 353 



Structure of neuromotor apparatus 354 



Function of neuromotor organs 359 



Evidence of neural function 362 



Chemical reactions 362 



Morphological relationships 362 



Behavior of organs at binary fission 367 



Division of micronucleus 367 



Division of macronucleus 368 



Formation of new cirri 372 



Formation of new peristome 373 



Formation of new neuromotor apparatus S7;T 



