LOESCHIA 



VI. In Abscesses : — 



L. kartulisi Doflein, 1901. 



VII. In serous exudations : — 

 L. miurai Ijima, 1898. 



All the above, except the last, are probably either L. coli or 

 L. histolytica, while the last may be the Leydenia stage of Chlamy- 

 dophrys enchelys Ehrenberg, which is often classified in the 

 Foraminifera. 



If this is accepted, we have only three species to consider — 

 viz.:— 



L. coli Loesch, 1875, emendavit Schaudinn, 1903. 

 L. histolytica Schaudinn, 1903. 

 L. gingivalis Gros, 1849. 



And these may, with difficulty, be distinguished as follows: — 



(a) Size small — 'average 12-20 microns : — • 



Endoplasm often contains red blood-corpuscles, cysts 

 with one nucleus— i. Gingivalis. 



[b) Size larger — average 25-35 microns : — ■ 



1. Endoplasm does not normally contain red blood- 



corpuscles. Cysts usually contain eight nuclei, but 

 may have sixteen^ — 2. Coli. 



2. Endoplasm normally contains red blood-corpuscles. 



Cysts contain one to four nuclei and characteristic 

 chromidial bodies — ^3. Histolytica. 



Amoeba in Animals. — -A full list of Amoebae according to hosts 

 was given by Hassall in 191 3 (see references), and therefore we 

 omit the full list given in previous editions, only a short list being 

 given on p. 321 but we may say that in vertebrates and inverte 

 brates a very large number of species have been described, but 

 many of these will probably be found to be the same. 



Type Species. — The type species in Loeschia coli (Loesch, 1875) 

 Schaudinn, 1903, which we will now describe. 



Loeschia coli Loesch 1875, emendavit Schaudinn, 1903. 

 Synonyms.' — Amoeba coli Loesch, 1875; Entamoeba coli Loesch, 

 1875. 



Probable Synonyms. — -Entamoeba tropicalis Lesage, 1908; E. nip- 

 ponica Koidzumi, 1909; E. williamsi Prowazek, 1911; E. Muris 

 Grassi; and perhaps others {vide supra). 



Definition.' — Loeschia with cysts containing eight nuclei, cyto- 

 plasm almost always without red blood-corpuscles, ectoplasm in- 

 visible except when a pseudopodium is being protruded. Nucleus 

 subcentral, vesicular, with cyclic changes not well marked. Karyo- 

 some often with two granules. 



Nomenclature. — ^The correct name is Loeschia hominis Casagrandi 

 and Barbagallo, 1897. The name L. coli was originally applied by 

 Loesch to the pathogenic amoeba which caused dysentery, but the 



