1922] Swezy: 3I)fosis in Eudamocha Coli 325 



SUMMARY 



Nuclear division in E ndamoeha coli is a simple mitosis whieh takes 

 place within the nuclear membrane. 



The chromosomes are probably six in number and divide before the 

 spindle is formed. 



Polar masses or centrosomes are formed by division of a chromatin 

 body probably derived from the karj'osome. An intradesmose con- 

 nects these bodies as they separate and continues to unite them until 

 the nuclei part in the telophase. 



The centrosomes, spindle, and intradesmose are contained within 

 the nuclear membrane, which is present throughout the entire process 

 of mitosis. 



Three successive mitotic divisions take place, resulting- in the pro- 

 duction of eisht nucleated cvsts. A fourth division mav also occur. 



LITERATURE CITED 



BOECK, W. C. 



1919. Studies on Giardia microti. Univ. Calif. Publ. Zool., 19, 8.3-136, pi. 1, 

 19 figs, in text. 

 DOBELL, C. 



1914. Cytological studies on three species of amoebae — A. lacertae Hartmann, 

 A. glebae n. sp., A. fluvialis n. sp. Arch. f. Prot., 34, 139-189, pis. 

 7-11. 

 1919. The amoebae living in man (London, John Bale, Sons & Danielsson). 

 Pp. vi + 155, 5 pla. 

 Glaser, H. 



1912. Uutcrsuchungen iiber die Teilung einiger Amoben, zugleich ein Beitrag 

 zur Phylogenie des Centrosoms. Arch. f. Prot., 25, 27-152, pis. 3-8, 

 5 figs, in text. 

 H.\BTMANN, M. 



1909. Autoganiie bei Protisten and ihre Bedeutung fiir des Befruchtungs- 



problem. Ibid., 14, 264-334, 27 figs, in text. 

 H.\RT.MANN, M. and Chagas, C. 



1910. Ueber die Kernteilung von Amoeba hyalina Dang. Mem. Inst. Oswaldo 



Cruz, 2, 64-126, pis. 4-9, 3 figs, in text. 

 KoroiD, C. A. 



1921. A critical discussion of the chroniidial formation of nuclei, of autogamy, 

 and of the multiple division of polyenergid nuclei, with special 

 reference to the unity of the mechanism of heredity in the Protozoa 

 and Metazoa. Anat. Rec, 20, 223-22.i. 



