184 FAMILY: AMCEBIDiE 



probably safe to assume that practically every vertebrate animal, as well 

 as many invertebrates, will be found to harbour amoebae belonging to this 

 genus. In the great majority of cases they are of the non-pathogenic 

 variety, and in this respect resemble E. coli. In a few instances, forms 

 associated with dysenteric symptoms have been described from animals. 

 The various species resemble one another very closely, so much so that 

 in many cases they could not possibly have been regarded as distinct 

 species, apart from the fact that they occurred in different hosts. 



There is some doubt as to the correct spelling of the name Entamceba. 

 The generic title was created in this form by Casagrandi and Barbagallo 

 (1895) for E. coli of the human intestine. Leidy (1879), however, had 

 given the name Endantceba blattcB to the amoeba of the cockroach. If this 

 form should prove to belong to the same genus as the human amoeba, 

 then Leidy 's name will have priority. As one of the cockroach amoebae 

 presents some peculiar features, it is better to regard it at present as 

 belonging to a distinct genus, Endamoeba (see p. 235). 



entam(eb;e of man. 



(a) Pathogenic Form. 



Entamoeba histolytica Schaudinn, 1903. — Chief synonyms : "Amoeba coli" 

 Losch, 1875; '"Amoeba dysenteriae" Councilman and Lafleur, 1891; Amoeba coli 

 (Loscli) Kovacs, 1892; Amceba dysenterice (Councilman and Lafleur) Kovacs, 1892; 

 Entamceba dysenterice (Councilman and Lafleur) Craig, 1905; Entamoeba coli var. tetra- 

 gena Viereck, 1 907 ; Entamoeba africana Hartmann, 1907 ; Entamoeba tetragena ( Viereck) 

 Hartmann, 1908; Poneramoeba histolytica hiihe 1909; Eiitamoeba minuta JL\n\assia,n, 

 1909; Entamceba nipponica Koidznmi, 1909; Entamceba hartmanni Prowazck, 1912; 

 Loschia (Viereckia) tetrajsna Cliatton and Laluno-Bonnaire, 1912; Entamceba 

 brasiliensis AragXo, 1912; Liischia histolytica (Schaudinn) Mathis, 1913; Entamoeba 

 venaticum Darling, 1915 ; Entamoeba minuta Woodcock and Penfold, 1916 ; Enda- 

 moeba coli (Losch) Aragao, 1917 ; Endamoeba dysenterice (Councilman and Lafleur) 

 Pestana, 1917; Entamoeba tenuis Kuenen and Swellengrebel, 1917; Entamoeba 

 minutissima Bvng, 1917; Endamoeba histolytica (Schaudinn) Craig, 1917; Entamceba 

 coli communis Knowles and Cole, 1917; Entamceba paradysenterica Chaterjee, 1920; 

 Caudamceba sinensis Faust, 1923; Karyamoebina falcata Kofoid (and Swezy, 1924); 

 Entamceba disj^ar Brumpt, 1925. 



Everyone who has studied the question is agreed that E. Jii.sfolytiea 

 was first seen and described by Losch (1875), and named by him " Amoeba 

 coli.'" Though this name was not correctly written in the original descrip- 

 tion given by Losch, it was employed for a long time for the amoebae of 

 the human intestine before it was fully realized that more than one species 

 existed. Similarly, Councilman and Lafleur (1891) proposed to call the 

 amoeba "Amoeba dysenteriae," another name which was not correctly 

 presented. Quincke and Roos (1893) and Roos (1894) were the first to 

 conclude that two types of amoeba occurred in man, the one an active 



