INTESTINAL AMCEB^ 



the karyosome and between this and the nuclear mem- 

 brane is a network of linin fibers. 



2. ENDOLIMAX 



In this genus the nucleus is vesicular but not always 

 spherical ; there is no layer of chromatin granules on the 

 nuclear membrane ; the karyosome is large and irregular 

 in shape and may consist of several portions attached to 

 each other by strands ; and often linin fibers extend from 

 the karyosome to the nuclear membrane. 



3. lODAMC^BA 



The nucleus of this genus likewise has no chromatin 

 granules on the nuclear membrane ; the single karyosome 

 is very large and is surrounded by a layer of globules 

 that do not stain as deeply as the karyosome ; often deli- 

 cate linin fibers extend from the karyosome to the nuclear 

 membrane. 



4. DIENTAMCEBA 



This genus is characterized by the presence in the 

 majority of specimens of two nuclei ; according to Jepps 

 and Dobell (19 18) 80 per cent are binucleate, whereas 

 Kudo (1926) found only 12.2 per cent of 2000 speci- 

 mens with two nuclei, and Craig (1926b) reports 67 per 

 cent of cultural forms of this type. The nuclei are spher- 

 ical and the chromatin consists of several granules em- 

 bedded in a matrix of plastin. Linin fibers may connect 

 this mass with the nuclear membrane. 



Among the genera of amoebae that have been described 

 from man but are not yet well established are Council- 

 mania (Kofoid and Swezy, 1921), Caudamcrba (Faust, 



57 



