UNIVERSITY OF CALIFORNIA PUBLICATIONS \/V- 



ZOOLOGY 



Vol. 20, No. 5, pp. 117-144, plates 15-17, 2 figures in text April 23, 1920 



ON THE MORPHOLOGY AND MITOSIS OF 

 CHILO^IASTIX MESNILI (WENYON), A 

 COMMON FLAGELLATE OF THE 

 HUMAN INTESTINE 



BY 



CHABLES A. KOFOtD 



Ajsro 

 OLIVE SWBZY 



CONTENTS 



PAGE 



Introduction 117 



Acknowledgments 119 



Morphology 119 



The active flagellate 119 



The neuromotor system 123 



The encysted flagellate 129 



Mitosis 133 



Discussion 135 



Summary 137 



Literature cited 138 



INTRODUCTION 



The present paper records certain observations on the free and 

 encysted stages of Chilamastix mesnili (Wenyon), a common flagellate 

 of the human digestive tract, made, in part during the course of 

 examinations of stools of soldiers, primarily for Endamoeba dysen- 

 teriae, and in part at Berkeley in conjunction with the vs^ork of the 

 Division of Parasitology of the Bureau of Communicable Diseases 

 of the California State Board of Health. The army examinations 

 were made at the United States Debarkation Hospital No. 3, New 



