180 PARASITIC AMCEB^E OF MAN. 



same organism was published by Hartmann and 

 Prowazek, who named it Entamceba africana. As 

 the description of Viereck was published before that 

 of Hartmann and Prowazek the name applied to the 

 organism by Viereck must remain as the proper 

 zoological name of this species. The observations of 

 the authors mentioned have been confirmed by Bensen 

 and others and it is now generally accepted that this 

 species is the cause of a form of amoebic dysentery. 

 At the time that I had the opportunity of study- 

 ing amoeba? in soldiers returning from the Philippines 

 to San Francisco, and in the Philippines, the species 

 now known as Entamceba tetragena had not been 

 described. I had several times observed amoeba? which 

 could not be considered typical of either Entamceba 

 histolytica or Entamceba coli in that they possessed 

 a distinct ectoplasm, a well defined nucleus contain- 

 ing much chromatin, and reproduced by simple 

 division and the formation of cysts containing four 

 daughter amoebae. I observed these organisms both 

 in soldiers suffering from dysentery contracted in 

 the Philippines and in the natives of those islands, 

 and until the description by Viereck of Entamceba 

 tetragena I considered them as atypical forms of the 

 other species. Upon looking over my notes of cases 

 observed during the past seven years I find frequent 

 notations of the occurrence of an amoeba correspond- 



