CELL-DIVISION. 37 
These lines of cleavage are not meridional furrows which divide the 
cell symmetrically, but they intersect each other at varying angles, 
marking off the surfaee of the cell by a network of grooves, in which 
the meshes are of an irregular shape and of unequal dimensions (Fig. 
14, E). 
Fic. 14,—-Cell-cleavage in Synchitrium discipens . 
A, sporangium mother-cell. 
B, Portion of cell showing two nuclei and two surface cleavage-furrows. 
C, multinucleate stage, showing progressive cleavage by furrows from surface. 
D, median section showing cleavage further advanced. 
E, section from surface of cell in early stage of cleavage. 
F, cell after segmentation is completed, showing uninucleate protospores.—(After Harper.) 
The cleavage is progressive from the surface inward, the furrows deepening 
in general in a radial direction. Still they may be curved, and are inclined 
to each other at very varying angles and frequently form intersections at points 
near the surface of the cell, thus cutting off superficial blocks of protoplasm of 
varying shapes and sizes (Fig. 14, C), so that we have a central solid mass or 
