242 FAMILY: AMCEBID^E 



the unencysted stages do not ingest solid food, he doubts if the parasite 

 is in reality an amoeba at all. A very similar parasite was seen by Alexeief? 

 (1913) in the vagina of the leech {Hirudo medicinalis). Dobell (1919) 

 thinks that if MalpighieUa refringens ultimately proves to be an amoeba, 

 E. nana may have to be placed in the genus MalpighieUa. An amoeba, 

 described by Epstein and Ilovaiski (1914) as Ncegleria ranarum, from 

 the frog probably belongs to the genus Endolimax on account of the 

 structure of the nuclei, and the encysted forms which resemble those of 

 E. nana. The free amcebse reached a diameter of 25 microns (Fig. 113). 



Tyzzer (1920) described a small amoeba which he found in the intestine 

 of fowls in America. In the free state it resembled E. nana, but the central 

 karyosome of the nucleus was more compact. Cysts with a single nucleus 



Fig. 113. — Endolimax ranarum from the Eectum of the FROG(xt«. 1,200). 

 (After Epstein and Ilovaiski, 1914.) 



a. Free form. b. Encysted form with four nuclei, 



c. Encysted form with eight nuclei. 



were seen. Though the name Pygolimax gregariniformis was given to the 

 amoeba on account of its peculiar gregariniform movements, it possibly 

 belongs to the genus Endolimax. 



Brug (1923), in Sumatra, has seen in the monkey, Macacus cynomolgus, 

 an amoeba which in its free and encysted stages corresponds with E. nana. 

 He names the amoeba Endolimax cynom.olgi. Chiang (1925) has given the 

 name Endolimax ratti to an amoeba of the white rat. It is morphologically 

 identical with E. nana, with which he was unable to infect rats. 



Genus: lodamceba Dobell, 1919. 



This genus was founded by Dobell for an amoeba of the human intestine 

 which produces a uninucleated cyst. The latter contains a very distinct, 

 sharply-defined iodophilic body of glycogen nature which stains a dark 

 reddish-brown in iodine solution. Because of the presence of this idio- 



