326 Holden . — Anatomy of Two Palaeozoic Stems from India. 
PLATE XIX. 
Fig. 13. Transverse section of bundle at node, showing group of primary elements, with large 
amount of proto xylem parenchyma, surrounded by transfusion sheath. 
Fig. 14. Transverse section of another similar bundle. 
Fig. 15. Longitudinal radial section through apex of bundle, showing especially protoxylem 
parenchyma, and broad transitional region of scalariform elements before reaching typical secondary 
wood. 
Fig. 16. Longitudinal section through group of primary elements, to show character of proto- 
xylem parenchyma. 
Fig. 17. One of the bundles of P'ig. 10 more highly magnified, to show how the protoxylem 
extends down the flanks of the bundle, so that a tangential section includes protoxylem on each 
side of the metaxylem. 
Fig. 18. Radial longitudinal section of secondary wood, showing closely crowded bordered pits 
of the tracheides and large fusion pits on radial walls of the rays. 
PLATE XX. 
Fig. 19. Dadoxylon bengalense : transverse section, showing annual rings. 
Fig. 20. Dadoxylon bengalense : radial longitudinal section, showing general coniferous type 
of wood. 
Fig. 21. Dadoxylon bengalense : radial section, showing size and arrangement of pits. 
Fig. 22. Dadoxylon bengalense : tangential section, showing low rays and bead-like characters 
of tracheide walls, caused by radial pits. 
