UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 20, No. 23, pp. 489-544, plates 43-48, 3 figures in text February 20, 1924 



THE DISTINGUISHING CHARACTERISTICS OF 



THE PARASITIC AMOEBAE OF CULTURE 



RATS AND MICE 



JOHN F. KESSEL 



CONTENTS 



PAGE 



Introduction 490 



Historical 490 



.\cknowledgments 491 



Material and methods 492 



Incidence of infection of amoebae in rats and mice 493 



Councilmania muris 495 



The motile amoeba 495 



Encystment 503 



Budding 507 



Mitosis 509 



Councilmania decmnani 511 



The motile amoeba 512 



Encystment 512 



Budding 514 



Mitosis 514 



Endamoeba raili 515 



The motile amoeba 515 



Encystment 516 



Experiments in cross-infection 517 



Discussion 522 



Summary 529 



Literature cited 531 



Explanation of plates 534 



