Two Palaeozoic Stems from India. 325 
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EXPLANATION OF PLATES XVII— XX. 
Illustrating Miss Holden’s paper on the Anatomy of Two Palaeozoic Stems from India. 
PLATE XVII. 
Fig. 1. Transverse section of entire stem, showing large pith, surrounded by vascular tissue 
with well-marked annual rings. 
Fig. 2. Transverse section at internode, showing secretory cells in the pith, small lumened 
transfusional sheath, primary wood in bundles, succeeded by radially arranged secondary wood. 
Fig. 3. Longitudinal section through interfascicular region, showing secondary wood abutting 
directly on the pith. 
Pig. 4. Longitudinal section, showing usual character of secretory cells in pith. 
Fig. 5. Longitudinal section, showing unusually elongated secretory cells. 
Fig. 6. Longitudinal section through apex of bundle, showing its endarch nature — at extreme left, 
transfusional elements with tracheoidal markings, becoming more elongated centrifugally ; next, 
protoxylem, metaxylem, and, finally, scalariform elements grading into secondary wood. 
PLATE XVIII. 
Fig. 7. Transverse section at node, showing two outgoing leaf-traces, separated by a large 
cauline bundle. 
Fig. 8. Transverse section at a slightly higher level, where the two leaf-traces have turned 
sharply in a horizontal direction. 
Fig. 9. Tangential section, showing the two traces widely separated in the secondary wood. 
Fig. 10. Tangential section including the pith and innermost part of two bundles. 
Fig. 11. Tangential section of leaf-trace embedded in secondary wood, showing low, 
uniseriate rays. 
Fig. 12. Tangential section, showing branching leaf-trace. 
