DESCRIPTION  OF  PLATES 
rile  figures  have  been  drawn  with  an  Abbe  drawing  apparatus, 
Apochroinatic,  2  mm.,  ap.  r4,  and  compensating  ocular  18. 
Figures  i,  2,  18,  21,  22,  26,  27  and  30  were  stained  with  safranine- 
raethylene-blue  orange-tannin.  All  the  others  were  stained  b}^ 
Heidenhain’s  method. 
Pl.vil  XIX 
!•  igs.  1-3.  Early  stage,  showing  db'ision  of  intranuclear  centrosorne 
(kar)'osome). 
1’ ig.  4.  Complete  nuclear  division.  One  half  shows  signs  of 
degeneration. 
Fig.s.  5,9. — Stages  showing  the  disintegration  of  part  of  the  cyto¬ 
plasm. 
Fig.  TO. — Later  stage  of  division  of  the  nuclei,  both  halves  of  which 
are  still  connected. 
Figs.  II,  12. — .Stages  showing  the  growth  of  a  new  flagellum. 
I'igs.  13-15.  Hcrpeioinonns-MlKe  forms. 
Figs.  16,  17.  Division  of  Herpeiovwnns-Xxl^e  forms. 
