AMOEBINA 



319 



dosome rich in chromatin, a layer of globules which surrounds the 

 endosome and which do not stain deeply, and achromatic strands 

 between the endosome and membrane; cysts ordinarily uninu- 

 cleate, contain a large glycogenous vacuole which stains con- 

 spicuously with iodine; in intestine of man or mammals. 



/. butschlii (Prowazek) (/. williamsi (P.)) (Fig. 146, g, h). In 

 colon of man; sluggish; 9-18m in diameter; cytoplasm with bac- 

 teria in food vacuoles; cysts mostly irregular in shape, 6-15ai in 

 diameter. 



Fig. 146. a, b, Entamoeba ranarum, X1090 (Mercier and Mathis); 

 c, d, Endolimax nana, X1670 (Kudo); e, f, E. ranarum., XS40 (Ep- 

 stein and Ilovaisky); g, h, lodanioeba butschlii, X1670 (Kudo); i-k, Di- 

 entamoeba fragilis, X1840 (Kudo). 



7. suis O'Connor. In colon of pig; widely distributed; indis- 

 tinguishable from I. butschlii; it is considered by some that pigs 

 are probably reservoir host of I. butschlii. 



Genus Dientamoeba Jepps et Dobell. Small amoeba; number 

 of binucleate trophozoites often greater than that of uninucleate 

 forms; nuclear membrane delicate; endosome consists of several 

 chromatin granules embedded in plasmosomic substances and 

 connected with the membrane by delicate strands; in colon of 

 man. 



D. fragilis J. et D. (Fig. 146, i-k). 4-12/i long; cysts unknown. 



Genus Schizamoeba Davis. Nucleus vesicular, without endo- 



