DIVISION OF COLLAR-CELLS OF CALCAREA HETEROCCELA. 139 
Fig. 16. — Equatorial plate showing remnant of collar (Grant ia ; 
Flemming fixation). 
Fig. 17. — Very early diaster-stage (Grantia). 
Figs. 18 and 19. — Diaster-stages (Grantia and Sycon). 
Figs. 20 and 21. — Division of cells. Note the junction between the 
nuclei in course of reconstruction and the blepharoplasts (Grantia). 
Figs. 22 and 23. — Newly divided cells. Note the condition of the 
nucleus. Both the cells and the nuclei are below the normal size 
(Sycon). 
Figs. 24-27. — Stage of division stained with Twort’s stain. Note the 
faint green colour of the blepharoplast-centrosomes (Grantia). 
Fig. 28. — Vegetative stage stained with T wort's stain (Grantia). 
VOL. 57 , PART 2 . NEW SERIES. 
