VII 



POLYPLOID NUCLEI IN PROTISTA 



211 



^^^ 



Nuclear multiplication in A ulacanlha. (Borgert. Z.J. A ., looi, and .-1 .P.K.. 1909.) A-C, stages m the division 

 of the primary nucleus during binary fission of the animal ; DC prchmmary stage's in gamete (ormatitMi. 

 A, resting nucleus ; B, mitosis, equatorial plate ; C. portion ot .111 anaphase shown on a larspr sc air ; U, 

 formation of secondary nuclei (the little dark specks in the cytoplasm) from the pnn ' ' le 



primary nucleus is almost used up in the production of the secoiidarv nuclei ; I-. a : .ci 



under a higher magnification, showing the single chromatin thread in each ; G, secondary nuclei m uuIum>. 



