UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 20, No. 14, pp. 333-364, plates 32-36, 5 figures in text November 9, 1922 



THE NEUROMOTOR APPARATUS OF 

 PARAMAECIUM 



BY 



CHAELES WIIXIAM REES 



CONTENTS „,^^ 



PAGE 



Introduction 334 



Acknowledgments 334 



Review of literature 334 



Micro-injection 336 



Technique and Methods 336 



Culture .,,. . 336 



Technique ' 336 



Morphology 338 



Brief description of Paramaecium 338 



Neuromotor apparatus " 338 



Neuromotor center , 340 



Peripheral fibers 341 



Fibers of the cytostome and cytopharynx 342 



The neuromotor system during division 344 



The neuromotor apparatus of Paramaecium compared with that of the 



flagellates and with other ciliates 345 



Experimental ., 346 



Micro-injection of vital dyes 346 



Intravitam staining 346 



Axial gradients 347 



Micro-dissection 349 



Discussion ? 350 



Summary 351 



Literature cited 353 



Explanation of plates 356 



