8 



13 



16 



FIG. II. Entamceba coli. (After Casagrandi and Barbagallo.) 15, 13, 10, 

 and 7, various stages in nuclear division of Entamceba coli; 4 and 1, divi- 

 sion of the nucleus into two as shown in the vegetative stage of growth; 16 and 

 11, schizogony and the formation of eight daughter-nuclei during the vegeta- 

 tive stage of development; 8, expulsion of a portion of the nucleus prior to 

 encystment; 5, first stage of encystment showing the homogeneous cyto- 

 plasm; 2, oval encysted form with homogeneous cytoplasm; 17, encysted 

 form within which eight daughter-nuclei have developed; 14, 12, and 9, 

 illustrating various stages of nuclear division in the encysted forms; 6, two 

 young amoebae leaving the cyst in which they have developed; 3, two young 

 amoeba? just after leaving the parent cyst. 



