214 MARY T. HARMAN 
and forms into an indistinct spireme which becomes a greatly 
tangled mesh, lying to one side of the nucleus (fig. E, plate 3), 
The nucleus is large and lies to one side of the cell. 
Figure C, plate 3, shows a group of cells in the early post- 
synaptic stage. There is not much change in the cytoplasm 
but the chromatin forms a definite, coarsely granular spireme 
which is in contact with a large nucleolus. In synapsis no nu- 
cleolus could be distinguished. This change in the chromatin 
goes on until it forms a finely granular reticulum which is in 
contact with the nucleolus. The chromatin remains in this 
condition during the remainder of the growth period. 
4. Maturation and fertilization 
Since both Child and Richards agree that maturation takes 
place by mitotic division, I have done no more upon this than 
figure a few maturation divisions. Figure F, plate 3, shows the 
metaphase of the first maturation division. The mitotic figure 
in maturation differs from the mitotic figure in segmentation, in 
having a smaller centrosome, and in the form of the chromosomes. 
The chromosomes in maturation are irregular, while in segmen- 
tation they are more definitely limited. The maturation spin- 
dle is always very long and one pole lies near the periphery of 
the cell. The segmentation spindle may be long or short and may 
lie in almost any position. 
Child states that in no case has he observed asters at any stage 
in maturation in Moniezia but thinks that they probably do occur. 
Richards finds faint astral radiations in the same form. In Tae- 
nia I find asters, but in some cases they are very faint, as also 
are the achromatic spindle fibers. However, after being fixed 
with Flemming’s strong solution, followed by a slow bleaching 
in turpentine and being stained with Heidenhain’s iron-alum- 
hematoxylin, the asters and spindles are more plainly visible. 
Figure H, plate 3, illustrates the more plainly visible astral rays. 
Inasmuch as fertilization does not bear directly upon the char- 
acter of cell-division I have not included that in my observations. 
