8 
horizontal section of the entire strobilus consisting' of a 
circle of these smaller sporangia! verticils which were so 
densely packed together as to disturb and mask the regu- 
larity of their arrangement. Having given off these spo- 
rangiophores with the reproductive organs which they 
supported, the verticillate foliar disk dipped suddenly down- 
wards and, describing a circular curve, as suddenly outwards 
and upwards, where it terminated in a verticil of numerous 
ovato-lanceolate bracts, which enclosed the exterior of the 
segment to which they belonged and protected the con- 
tained sporangia. The author pointed out where the strobilus 
differed from those described by Binney and Carruthers. 
In the former each node gave off a horizontal verticil of 
coalesced bracts, from the centre of which a series of sporan- 
giophores ascended as vertical divergent branches, whilst 
in the latter there was an alternating arrangement, one node 
giving off the disk of coalesced bracts, and the next a verticil 
of sporangiophores springing at right angles from the central 
axis, and having their respective sporangiophores clustered 
round them in perpendicular verticils. In the author’s 
example the sporangiophores were densely filled with spores, 
each consisting of an outer cell-wall, an inner cell-mem- 
brane or primordial utricle, and cell contents wdiich were 
often aggregated into a distinctly defined mass in the centre 
of the cell. There were no traces of elaters connected with 
the spores. 
The author pointed out that in its general aspect and in 
the type of its structure the strobilus was unmistakably 
Calamitean — the peculiarity in the position of its sporangio- 
phores being merely generic. Its Calamitean character was 
further established by the peculiar arched arrangement of 
the vascular bundles where they cross the nodes — an ar- 
rangement which the author has never seen except in Cala- 
mites. All the detailed features of the strobilus distinguish 
it from those described by Binney and Carruthers, and 
