OF THE ALi:\lENTARY TRACT 123 



tegration in stools. Its cysts are relatively unknown. 

 Consequently it is to the ordinary examiner a rare 

 or unknown amoeba. It is apparently harmless to 

 its host. 



Thomson and Robertson (1925) report its cultiva- 

 tion on Boeck and Drbohlav's L. E. A. medium. 



OTHER AMOEBAE OF MAN 



Karyavioehina falcata. Kofoid and Swezy (1924 

 and 1925) describe a new genus and species of amoeba 

 from the intestine of man, occurring in six instances 

 out of 13,894 stool examinations of 3000 persons. 

 "This amoeba is characterized by one, rarely two or 

 more, blunt hyaline pseudopodia." Ectoplasm and 

 endoplasm are sharply separated. The endoplasm 

 is coarsely vacuolated; food bodies are rare in these 

 vacuoles. 



"The nucleus contains one or two, rarely more, 

 large crescentic, siderophile masses applied to the 

 nuclear membrane and little chromatin otherwise 

 applied to the membrane." There is a "neatly 

 spherical, eccentric karyosome." Cysts were not 

 found. The organism resisted treatment for intes- 

 tinal amoebiasis. 



Caudamoeba siijesis. Faust (1923) has described 

 from cases of amoebic dysentery an amoeba, ingesting 

 both red'blood corpuscles and bacteria, and moving in 

 a slug-like manner, having definite polarity, with the 



