122 SIDNEY F. HARMER. 
It may be noted that the embryophore may now contain 
ege-like cells (fig. 34, a), which are similar to the giant-cells 
that I have described in Crisia. I have never found these 
cells showing the slightest evidence of being really eggs; 
whereas the dividing primary embryo is quite unmistakable 
at this stage. I therefore attribute a purely subsidiary part to 
these cells, and I do not believe that they have any direct 
share in the development of embryos. I have not found giant- 
cells during the earlier stages of the development. 
The aperture of the ovicell commences to develop at this 
stage, as is distinctly shown by the sections. We have seen 
that the fertile brown body of earlier stages is surrounded by 
a deeply staining mass of cells which may be in immediate 
contact with an invagination of the body-wall (fig. 27). In 
this stage the condition closely resembles a stage which I have 
described in Crisia (6, pl. xxiii, fig. 12), except that the 
latter has no brown body. ‘The tubular aperture of the ovicell 
of both Crisia and Lichenopora is closely connected at its 
base with the deeply staining mass of cells or its derivatives. 
In the latter genus these cells grow towards the distal surface 
of the zoccium which contains them, just as in Crisia they 
grow towards the distal surface of the ovicell. A cavity next 
appears in the mass of cells, immediately above (distal to) the 
brown body. This cavity, which is at first merely a series of 
vacuoles, is usually perfectly definite near the brown body, and 
may extend as a space, which appears crescentic in a longitu- 
dinal section, halfway round the brown body. Tracing this 
space upwards, it becomes less definite, and it extends into the 
base of the tubular aperture of the ovicell. A transverse sec- 
tion of the ‘‘ aperture ” at this stage usually shows an external 
thin, body-wall which surrounds the part of the body-cavity 
which extends into the tube. The centre of the transverse 
section is occupied by a solid mass of cells, whose diameter is 
about half of that of the entire tube. Lower down the solid 
mass becomes excavated by a lumen which becomes continuous 
with the cavity which occurs near the brown body. Below 
the latter the cavity passes into an irregular space, traversed 
