248 FAMILY: AM(EBID^ 



Brug (1920a) described as Endolimax lueneni an amoeba lie met with 

 in the monkey, Macacus cynomolgus. The amoebae were 7 to 12 microns 

 and cysts 7 to 10 microns in diameter. The latter closely resembled the 

 cysts of /. butschlii, and it is evident this monkey amoeba belongs to the 

 same genus, its name becoming /. keuneni (Brug, 1920). Hegner and 

 Taliaferro (1924) state that they have seen what appears to be the same 

 parasite in the Brazilian monkey, Cebus variegatus, while the writer has 

 seen the cysts of a similar form in the faeces of a gorilla. 



Genus: Dientamoeba Jepps and Dobell, 1918. 



The genus includes small, delicate, actively motile, parasitic amoebae, 

 which show a tendency to remain in a binucleate condition. The nucleus 





r\)t- 



% 



2 3 





Fig. 116. — Dientamceha frag His ( x 3,000). (Original.) 



1. Vegetative form with two nuclei. 



2. Vegetative form with two nuclei, one of which has the chromatin on the nuclear membrane. 

 3-5. Forms with two nuclei. 6-9. Forms with one nucleus. 



has a characteristic structure, and encysted forms have been once re- 

 corded. The single known species of this genus was described by Jepps 

 and Dobell (1918) as a parasite of man. They noted eight cases, 

 while Jepps (1921) mentioned ten others in England. The writer saw 

 this form in 1909, but at that time formed no opinion as to its nature. 

 It has been recorded in America by Kofoid, Kornhauser, and Plate (1919), 

 and by Taliaferro and Becker (1922a, 1924); in Manila by Haughwout 

 and Horrilleno (1920), both in children and adults; by Bijlsma (1919) in 

 Holland; by Noller (1921) in Hamburg; and by Thomson, J. G. and Robert- 

 son (1923), and Robertson (1923) in England. Reichenow (1923) examined 

 the stools of 100 patients in Germany, and found the amoeba in five of these. 



