ENTAMOEBA COLI 7 1 



States of America (Giffin, 1913) ; and in the British Isles (Yorke, Carter, 

 Mackinnon, Matthews, and Smith (1917), Laidlaw (1918), Matthews 

 and Smith (1919), BayHs (1919), etc.) — in addition to all the tropical 

 and subtropical countries where its occurrence, as known from the 

 diseases which it produces, has long been famous. It is hardly possible 

 to doubt that E. histolytica occurs wherever man occurs — though the 

 frequency of infection is probably not equal in all places and among 

 different populations.* 



(2) ENTAMOEBA COLI (GRASS I, 1879) CASAGRANDI & BARBAGALLO, 



1895 {NEC LOSCH, 1875). 



"Amoebae" Lewis, 1870. 



"Amoebae" Cunningham, 1871. 



" Psorospermi " Grassi, 1879 {pro parte). 



Amoeba coll Grassi, 1879 {nee Losch, 1875), 



Protoniyxomyces coprliiarlns Cunningham, 1881 {pre parte). 



? Amoeba Intestlnalls Blanchard, 1889. 



Amoeba coli mitis | ^^.^^^^^ ^ ^ ^g 



Amoeba intestmi vulgaris) ^ ^^ 



Entamoeba coli Casagrandi & Barbagallo, 1895. 



Entamoeba liominis Casagrandi & Barbagallo, 1897. 



Entatiioeba coli Schaudinn, 1903 {iiec Losch, 1875). 



" Entamoeba Loeschi " Lesage, 1908. 



Amoeba coll Brumpt, 1910 {nee Losch, 1875). 



Entamoeba wllliamsl Prowazek, 191 1. 



Entamoeba hartmannl Prowazek, 1912 {pro parte). 



Entamoeba braslllensls Ar3.giiO, 191 2 {pro parte). 



Loschia coli Chatton & Lalung-Bonnaire, 191 2. 



Entamoeba coli communis Knowles & Cole, 1917 (pro parte). 



Endameba intestinlvnlgarls Aragao, 1917. 



Endamocba intestino-vnlgaris Aragao, 19 17. 



Endameba coli Craig, 191 7. 



Endameba hominis Pestana, 1917. 



History and Nomenclature. 



The species here named Entamoeba coli was probably discovered by 

 Lewis (1870) in India. He saw " amoebae " in the stools of patients 

 suffering from cholera, but from his account it is impossible to identify 

 their species with certainty. At about the same time, however, his col- 

 laborator Cunningham (1871) made similar observations; and from the 

 latter's publications it is possible to identify their findings with some 

 certainty. Cunningham (1871) says that he found "amoebae" in 18 per 

 cent, of the choleraic stools which he examined in Calcutta ; and as he 

 has carefully noted some of their characters, there can be no doubt that 

 what he called "amoebae" really were these organisms — not cells or 



* It seems equally certain that there is only one species of amoeba responsible for 

 all the amoebic diseases — dysentery, liver abscess, etc. — all the world over. At all 

 events, no amoeba other than E. histolytica has ever been proved to be pathogenic to man 



