1896] PROCARP AND CYSTOCARP OF PTILOTA 365 
arisen the first cell of the cystocarp (7). On the right side of 
the figure drawn in outline, only the position of the nuclei being 
indicated by shading, are the remains of some of the other pro- 
carps of the group with the basal portions of their withered 
trichogynes. Whenever dotted lines appear in the figures, they 
mean that the structures indicated were present in the section of 
the series next the one from which the drawing was made. 
The carpogenous cell does not give rise to this first cell of 
the cystocarp until the trichogyne has begun to wither, and is 
therefore entirely separated from the cell of the trichophoric 
apparatus. The first cell of the cystocarp increases in size 
until it quite fills up the space between the procarps, and then 
by a transverse division it cuts off a small cell at its base. 
(fig. 78). The lower cell takes no further part in the devel- 
opment of the cystocarp; the upper cell gives rise to the lobes 
of the favella. 
At this point it may be well to consider the possibility of 
there being cross-fusion between any of the cells of the procarps 
and those of the young cystocarp. The cells of the young 
Cystocarp are separated from all the cells of the procarps by 
walls which stain heavily, as has been indicated in fig. 77- aa 
hone of the many specimens examined was there any indication 
of the presence of ooblastema filaments or of fusion processes 
budded out from any cell of the procarps. As the sections were 
serial the relation of all the cells of the procarps and cystocarps 
to one another might be studied, and it seems to the writer quite 
impossible that there could be any connections formed between 
any of the cells that would not appear on the slides. 
The favella consists of a variable number of lobes, from — 
to five, which asa rule are in widely different stages of maturity. 
They are quite separated from one another, but are all attached 
to the second cell (cell x? in figs. 79 and 20) of the cystocarp. 
A lobe develops in the following manner. The second cell of 
the cystocarp pushes out in the form of a pear shaped process 
that becomes cut off as acell. This cell by forward growth and 
a few irregular divisions gives rise to a short filament of thick 
