( 369 ) 
entiation, and there is no variation from the typical form 
worthy of mention. 
Cyclanthera 
In the very young ovules the cells are arranged in confocal 
series and the archesporial cell is not easily distinguished 
from the others in size or other features (fg. 760). Subse- 
quently the spore-mother-cell appears quite distinct and the 
tapetal cells to the number of two or more, separate it from 
the epidermis (7g. 76r). At this time the initial stage in 
the formation of the inner integument is visible in the usual 
form of a slightly elevated ring due in some places to a radial 
elongation of epidermal cells and in others to periclinal 
divisions of the hypodermal elements (fg. 767). In the sub- 
sequent growth of the ovule the sporogenous cell becomes 
deeply placed in the nucellus. The repeated divisions of the 
original tapetal cells and the parietal series are evident. The 
long axial series of cells thus formed is shown in figure 762. 
The spore-mother-cell undergoes the usual divisions and 
the fertile cell resulting is here also the lowermost of the series 
(fg. 163). The remains of the non-functional megaspores 
are evident for some time around the distal end of the embryo- 
sac. 
In the development of the embryo-sac from this point on 
only one early stage was observed. This was the two-cell 
stage resulting from the division of the megaspore. There 
is no indication of any irregularity in the process of develop- 
ment. In figure z6¢ a nearly mature embryo-sac is shown 
and this differs in no conspicuous way from those previously 
cited. The egg-apparatus presents the usual appearance 
with striated and vacuolated synergids. The antipodals are 
evanescent and apparently devoid of any important function. 
The cytoplasm surrounding the polar nuclei presents a 
rather peculiar appearance (jig. 764). The coarser elements 
of this cytoplasm are distributed in a radiating order around 
the polar nuclei, which here are seen to be in contact. Bodies 
with the aspect of vacuoles, whose limiting membrane stains 
deeply and appears to be relatively thick, are quite conspicu- 
