232 



FAMILY: AMCEBID^ 



studied in tadpoles by Collin (1913), who found that the free amoebsG 

 sometimes had as many as thirty nuclei (Fig. 107, 7). He regarded these 

 as schizonts. The amoBba was again studied by Mercier and Mathis 

 (1918), who described two types of cysts. The usual form had four nuclei, 

 like the cysts of E. histolytica, while the other had as many as sixteen 

 nuclei (Fig. 107, 8). As in the case of E. coli, it was conjectured that the 





mm 



Fig. 107. — Ev.tamoeha ranarum from the Intestine of the Frog. (1-6 after 

 DoBELL, 1909; 7 after Collin, 1913; 8 after Mercier and Mathis, 1918.) 

 1. Free form ( x 2,000). 2-6. Encysted forms ( x 2,000). 



7. Multinucleated free form (x 1,000). 8. Multinucleated encysted form (x 1,400). 



cysts with a small number of nuclei were gamete-producing cysts, while 

 those with a larger number represented schizogony cysts. No proof in 

 support of this view was obtained (see p. 218). 



Ilowaisky (1922) has described spontaneous amoebic abscess of the 

 liver in frogs. The amoebse present resembled E. ranarum, which occurred 

 in the intestine of the same animals. The amoeba seen by Chatton 



