NUCLEI AND KINETIC ELEMENTS 



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FiG. 4:1.—Hartmannella (Pseudochlamys ?) klitzkei Arndt. Centrosome and cen- 

 triole in a testate rhizopod. A, Animal with watch-glass-like shell; B to F, origin 

 of the centrosome in the cytoplasm, its division, and position on the spindle; G, 

 anaphase stage of nuclear division. (After Arndt.) 



