228 



FAMILY: AMCEBIDiE 



Rats and mice are very commonly infected with amoebse [E. muris 

 (Grassi, 1879)] which closely resemble E. coli both in the free and encysted 

 stages (Fig. 105). Briig (1919a) has noted that while E. nmris, regarded 

 by Rudovsky (1921) as a variety E. muris-decummii, is the common 



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Fig. 105. — Entamoeba maris from the Intestine of a White Mouse ( x 3,000). 



(Original.) 

 One unencysted form and three encysted forms with two, four, and eight nuclei. 



form seen in rats, occasionally amoeba? of the E. histolytica type are met 

 with. Lynch (1915) and Chiang (1925), who also found amoebae. of this 

 type in rats, believe that rats may actually act as carriers of E, histolytica 

 (see p. 200). 



