SARCODINA 10G9 



Cysts. Before encystment the parasite extrudes all food par- 

 ticles and the protoplasm becomes clear, all movement ceases and 

 the parasite assumes a round or oval form and the secretion of a 

 cyst wall begins. The mature cyst has four nuclei, whose internal 

 structure resembles that of the vegetative form; that is, there is a 

 karyosome made up of a central mass and more or less detached 

 lobules of chromatin. There are no chromatoid rods in the cytoplasm 

 as in histolytica but there are granules which give the staining 

 reactions of volutin. In iodin solution the cysts are stained yellow ; 

 in some may be noted masses of glycogen, but this substance is 



a b c d 



FIG. 130. ENDOLIMAX NANA. This figure contains figures Nos. 23, 25, 26 and 27 of 

 plate No. 2, Dobell's "Amoebae Living in Man." The first figure on the left 

 represents an active amoeboid form. The next three show uninucleate, binu- 

 cleate and quadrinucleate (mature) cysts, respectively. Plate 11 of "Amoebae 

 of Living Man" by Clifford Dobell, published by John Bale, Sons & Danielsson, 

 London. 



commoner in the vegetative, precystic and young cysts than in those 

 which are mature. 



Pathogenicity. It is not believed that the parasite causes any 

 disease ; it may however be found in connection with histolytica and 

 thus cause confusion. No treatment so far given has had any 

 influence on the organism. 



IODAMCEBA BUTSCHLII (Prowazek, 1912, Emend. Dobell, 1919) 



(Entamceba butschlii, Prowazek, 1912. Iodin Cysts or I. Cysts, 

 Wenyon, 1916. Pseudolimax, Kuenen and S\v ellengrebel, 1917.) 



"Wenyon in 1915 described quite briefly some spherical bodies 

 containing an inclusion which stained with iodin solutions. Later 

 he called these I or iodin cysts and under that name they have 

 been recognized by many as not very rare. They are always found 



