-----+----------------+-----------------+----------------+---------------- | Entamoeba | Entamoeba coli | Endolimax nana | Iodamoeba | histolytica | | | bütschlii -----+----------------+-----------------+----------------+---------------- Size | 20-30µ | 20-30µ | 6-12µ | 9-13µ -----+----------------+-----------------+----------------+---------------- Moti-|Very character- |Usually sluggish |Slow progressive|Slight motility lity| istic. Flows in| but may show | movement when | with movements | almost straight| considerable | freshly passed.| similar to | line across | activity when | Later slight | E. coli. | field. Later | freshly passed. | changes of | Quickly | becomes less |The movement | shape. Soon | degenerates | active pushing | consists chiefly| rounds and | and dies. | out a few, | in changes of | dies. | | large blunt, | shape without | | | blade-like | progression. | | | pseudopodia | | | | which are per- | | | | fectly hyaline | | | | being composed | | | | entirely of | | | | ectoplasm. | | | -----+----------------+-----------------+----------------+---------------- Cyto-|Endoplasm finely|Endoplasm had a |Endoplasm finely|Endoplasm finely plasm| granular and | bulky granular | granular with | granular and | uniform in | appearance and | numerous minute| homogeneous. | appearance. May| contains numer- | food vacuoles |Usually contains | contain red | ous food | containing | numerous food | blood cells but| vacuoles charged| bacteria. |vacuoles charged | bacteria | with bacteria |No sharp line as| with minute | probably never | and vegetable | a rule between | bacteria. Cysts | seen in normal | débris. Never | the endoplasm | of this amoeba | individuals. | contains red | and ectoplasm. | have previously |Ectoplasm clear | blood cells. No | | been described | and well | sharp line be- | | been described | developed. | tween endoplasm | | as “iodine | | and ectoplasm. | | cysts.” -----+----------------+-----------------+----------------+---------------- Nuc- |4-7µ. A delicate| 4-7µ. |1-3µ. Vesicular |2-3.5µ. Small leus | vesicle incon- | Distinguishable.| with delicate | vesicle with | spicuous or | Stained shows | membrane. | distinct mem- | invisible. | larger beads of |Stained shows | brane.