size. There are no close resemblances between this new 
species and those hitherto known. 
It is noteworthy that the small number of megaspores 
per sporangium is a characteristic shared among fossil ly- 
copsids only by Bothrodendron mundum and Selaginel- 
lites primaevus. This is not the less significant, because 
the relationships of the new form are with the existing 
Selaginella—in its most restricted sense. 
Description of the Gametophyte. 
More than fifty megaspores show nucleated cellular 
masses in varying degrees of complexity and organiza- 
tion. ‘The material thus permits a detailed description. 
The earliest stage in development is to be observed 
in preparation number 2. A tetrad of spores is still in 
conjunction, but the protoplasmic contents are crowded 
in the apex of each spore into a ‘‘vesicle’’ which has a 
dense (presumably nuclear) region near its own apex. 
This stage is shown in the lower figure of the first plate. 
The succeeding events are best preserved in prepara- 
tions 2, 13, 16, and 19, and are well preserved in prep- 
arations 1, 3, 4, 6, 14, 20, and 26. The vesicle appears to 
have become much larger and nuclei are present, at first 
without cell walls. he spore shown at the top of plate 
2 shows many ovate nuclei and the several spore mem- 
branes which are not clear on the illustration because they 
are beyond the depth of focus. The larger gametophytes 
show increasing numbers of nuclei which are enclosed by 
cell walls. In several spores (preparations 1, 8, 6), the 
early cell-plates are beautifully preserved. 
The most advanced and best preserved gametophyte 
is that shown under three different magnifications: the 
first, within the megaspore on plate 2, and two others on 
plate 3. The figure on plate 2 also shows the peripheries 
of two sister spores which are, of course, within the meg- 
[ 124 ] 
