i64 RESEARCH IN PROTOZOOLOGY 



known to be infected with species belonging to this genus. The 

 writer has recently obtained species from ducks, guinea fowls and 

 sheep by injecting material from the ceca of these animals into 

 the rectum of parasite-free chicks. In the ceca of chicks Endolimax 

 multiplies very rapidly and within a few days enormous numbers 

 of specimens are available for study. 



Not so many species of lodamocba are known to occur in animals. 

 Specimens of this genus have been recorded from monkeys and 

 pigs. It seems probable that other animals are also infected with 

 their own peculiar species of this genus. Thus far the only species 

 of Dienfamccba reported is Dicnfamccba fragilis which occurs in 

 man. It has been suggested that this may be a species normally 

 present in some other animal and only rarely a parasite of man 

 since it has been reported from human beings in only a small 

 number of cases. 



To the family dimastigamcebid^ belongs the species Dimastiga- 

 mccba grubcri which is a coprozoic form that may be obtained 

 without difficulty from the feces of man and other animals. It has 

 a flagellate stage in its life-cycle and represents a species that 

 might be considered either an amoeba or a flagellate. Mastigina 

 hylce is a species that possesses a short flagellum. It occurs in the 

 rectum of frogs and has recently been studied by Becker (1925, 

 1928). Another species, Mastigina bovis, has been reported from 

 the stomach of cattle. 



