210 



FAMILY: AMCEBID^ 



As pointed out by the writer (1925), from the fact that the cases from 

 which K. falcata was first recorded harboured E. histolytica also, w^hile two 

 of them had other amoebae as well, it seems that definite proof that the 

 so-called K. falcata is a distinct entity has not been produced. It is 

 known that in E. histolytica the nucleus not infrequently shows chromatin 

 arranged in crescentic masses, and it has yet to be demonstrated that 

 in nuclear division such nuclei never assume the form supposed to be 

 characteristic of K. falcata. 



Of quite another nature are the supposed amoebae which Kofoid and 

 Swezy (1922) and Kofoid, Boyers and Swezy (1922) have described from the 



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Fig. 



98. — Free Forms of " Kanjamcebina falcata '" ( x 2,000). 

 Swezy, 1924, Slightly Reduced.) 



(After Kofoid and 



1. Form with clear pseudopodium and single crescentic body on nuclear membrane. 



2. Nucleus with two crescentic bodies united by a fibre. 



3. Dividing form: nucleus with pole caps, centrioles united by centrodesmose, and equatorial 



plate of about twenty dividing chromosomes. 



bone marrow of cases of arthritis deformans, and from the hypertrophied 

 lymphatic glands in Hodgkin's disease. Because of a particular type of 

 division exhibited by the nuclei of certain cells, it is concluded tliat they 

 are not only amoebae, but actually E. histolytica. It must be apparent to 

 most protozoologists that far more convincing evidence is required before 

 this view can be accepted. 



(b) Non-Pathogenic Forms. 



Entamoeba coli (Grassi, 1879) Casagrandi and Barbagallo, 1895. — 

 Chief synonyms: "Amcebse" Lewis, 1870; "Anioebse" Cunningham, 1871; Amoeba 

 coli Crassi, 1879; "Amoeba coli mitis" Quincke and Eoos, 1893; "Amoeba intestini 

 vulgaris" Quincke and Roos, 1893; Entamceba coli, Casagrandi and Barbagallo, 1895; 



