UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



VoL 20, No. 20, pp. 431-445, 19 figures in text October 31, 1923 



ON THE GENUS COUNCILMANIA, BUDDING 



INTESTINAL AMOEBAE PARASITIC 



IN MAN AND RODENTS 



BY 



CHARLES A. KOFOID, OLIVE SWEZY, and JOHN F. KESSEL 



CONTENTS 



PAGE 



Introduction 431 



Counciliiwnia Kofoid and Swezy 1921 432 



Nomenclature 433 



Councilmania lafleuri Kofoid and Swezy 1921 435 



Councilviania muris (Grassi) 438 



Councilmania decumani (Budovsky) Kessel 439 



Key to species of Councilmania 443 



Summary 444 



Literature cited 445 



INTRODUCTION 



The parasitic intestinal Protozoa of the mammals, including man, 

 reveal many suggestions of an evolutionary origin from stocks repre- 

 sented in comparable parasites of the lower vertebrates. This rela- 

 tionship is exhibited by the fact that every protozoan genus of this 

 faunal assemblage of the intestine of man is represented either by 

 other species in the lower vertebrates or by closely related or more 

 primitive genera. These genera may even extend to invertebrate 

 hosts; for example, Endamocba is found not only in mammals but 

 also in the cockroach, while Craigia (Paramoeba) occurs also in 

 Sagitta. The trichomonad flagellates have an as yet little known, 

 but certainly wide distribution in both vertebrates and invertebrates. 

 The most complex derivative of this group, the genus Giardia, has 



