37 ° Hickling . — The Anatomy of Palaeostachya vera . 
Latterly, in his joint paper with Dr. Scott , 1 Williamson yielded again 
to the view, now undoubted, that Calamos tacky s was a true Calamitean 
fructification, thus admitting it to a closer relationship with Palaeostachya. 
Fig. i. Diagrammatic Longitudinal Section of Cone, x 14 . Vascular tissue, black. Soft 
parenchyma, dotted. Sclerized, lined. Left side passes through bundle ; right , between bundles. 
In each case plane of section would pass between adjacent sporangia ; on left these are omitted for 
clearness, on right they are inserted as solid objects in surface view. D.C . , ‘ disc-canal.’ The 
sclerized tissue is here indicated (by broken lines) as seen through the parenchyma, which fills it ; 
Pt.xy. C., protoxylem-canal of main bundle ; S. Pt.xy. C ., protoxylem-canal of sporangiophore-trace ; 
Pt.xy ., plug of protoxylem left in the canal at the node. The only fact of importance indicated in 
the diagram for which the evidence is not quite satisfactory is the superposition of the sporangio- 
phores over the bracts, and the superposition of the successive whorls. 
• . i 
This view of the relationship I hope to confirm in the present paper with 
the more ample data for comparison, provided by a complete reinvestigation 
of all the existing sections of Palaeostachya undertaken at the suggestion 
1 Williamson and Scott, ’94. 
