AMOEBA OF THE INTESTINAL TRACT. 215 



the parasite is much larger than Trichomonas, and 

 as both it and Entamoeba Mstolytica were present in 

 the feces of some of the cases examined, comparison 

 was easy, and he is sure that it did not correspond 

 to either of the latter organisms. His observations 

 have not been confirmed. 



PARAMCEBA HOMINIS. Craig, 1906. 



In August, 1906, I published the description of 

 a new species of amoeba to which I gave the name 

 of Paramceba hominis. The genus, Paramceba, was 

 established in 1896 by Schaudinn, to include a water 

 amoeba which he described at that time. Schaudinn's 

 species occurred in sea water and was peculiar in 

 that a flagellate stage of development alternated with 

 an amoebic stage. The organism described by him, 

 after multiplying for several generations by simple 

 division, at the end of its vegetative life becomes en- 

 cysted, and within the cyst there develop swarm- 

 spores which are liberated, and after living as flagel- 

 lates and multiplying by longitudinal division, finally 

 lose their flagellum and again become typical amoeba?. 

 Schaudinn described the process of spore formation 

 as consisting in the division of the nucleus of the 

 encysted amoeba, this division being preceded by the 

 division of a cytoplasmic body lying in contact with 

 the nucleus, which acts as a centrosome or blepharo- 



