On a Cone of Calamostachys binneyana, 251 
are seen. The axis does not present any unusual features. The 
number of sporangiophores in a whorl cannot be made out in the 
absence of transverse sections, but it seems to have been about 
the usual number, and their form and arrangement were normal. 
The sporangium walls are seen in several places, but it is not 
possible to determine the number of sporangia present on each 
sporangiophore. Apparently most of them had dehisced before 
preservation took place, and only a few spores are seen which show 
no signs of heterospory. 
The bracts are of the usual type, some of them are very well 
preserved and show several interesting features. The exact number 
in the whorl cannot be accurately determined, but it was probably 
approximately double that of the sporangiophores. They are united 
at the base into a disc, about 3 mm. in diameter, and on becoming 
free turn sharply upwards; their free portions are 1—2 mm. in 
length. Each has a small vascular bundle which is seen in 
transverse section near the axis in Text-fig. 31. Its centre is 
Text-fig. 31. Transverse section, near the axis, through the vascular bundle 
of a bract, x., Small xylem tracheides in centre, p., Clear thin-walled cells 
(phloem), surrounded by thick-walled cells of cortex and disc, x 250. 
occupied by a group of very small xylem tracheides, and this is 
surrounded on all sides by thin-walled cells. It seems not unlikely 
that the latter tissue is phloem, and, consequently, the bundle may 
have been concentric, and not collateral as formerly supposed. It 
should be remarked, however, that we have no means of finding out 
whether the thin-walled cells were really phloem, and it is possible 
that true phloem was absent from the bundle. 
The tissue of the disc is differentiated into two parts, that at 
the base of the bracts consisting of clear cells with thin walls, 
