Comparative Anatomy of the Casuarineae. 263 
Fig. 12. Transverse section through a portion of the wood of C. glauc a , Sieb., 
showing three transverse bands of parenchyma (pm) traversing the fibrous 
tracheides (f tr) between two medullary rays (nir). Each of the bands forms 
part of a concentric circle of tissue or 1 false annual ring.’ X335. 
Fig. 13. Longitudinal sections through the terminal w’alls of three sieve-tubes 
of C. glauca , Sieb., one of which is radial, showing four plates in surface-view, 
the other two tangential, showing from two to eight plates in section, x 500. 
Fig. 14. Longitudinal radial section of terminal wall of a sieve-tube of C. glauca, 
Sieb., showing nine plates in surface-view, x 335. 
Fig. 15. Longitudinal section of a portion of a sieve- tube of C. glauca , Sieb., 
showing a companion-cell, x 500. 
Fig. 16. Longitudinal section of parenchymatous tissue of C. tenuissima, showing 
a vertical row of four parenchyma-cells abutting on a vessel, x 250. 
Fig. 17. Longitudinal section of two cells from a concentric band of paren- 
chymatous tissue of C. glauca, Sieb. x 335. 
Fig. 18. Terminal wall of a vessel from a radial section of C. sp., showing a 
single narrow perforation, x 250. 
Fig. 19. Longitudinal section of a portion of a vessel of C. glauca, Sieb-, showing 
the terminal wall, with a single large perforation, in section, x 250. 
Fig. 20. Terminal wall of a vessel in C. sp ., exhibiting ladder-like perforations. 
X250. 
Fig. 21. Terminal wall of a vessel in C. sp., showing reticulate perforations. 
X500. 
Fig. 22. Terminal wall of a vessel in C. sp., showing transitional stage from 
ladder-like or reticulate to a single perforation, x 250. 
Fig. 23. Terminal wall of a vessel in C. glauca, Sieb., showing ladder-like 
perforations in section, x 335. 
Fig. 24. Vessel from the wood of C. suberosa , Ott. et Dietr., showing a tertiary 
spiral. X335. 
Fig. 25. Vessel from the macerated wood of C. glauca, Sieb., showing the narrow 
prolongation beyond the position of the perforation, x 250. 
Fig. 26. Portion of a fibrous tracheide from the wood of C. sp., showing its 
closed end, and the bordered pits on the walls, x 250. 
Fig. 27. Portion of a fibrous tracheide from the wood of C. glauca, Sieb., in 
which bordered pits have become entirely suppressed, x 250. 
Fig. 28. A tracheide occurring near the pith ; with a row of parenchymatous 
elements and a fibrous tracheide on its outside (from C. glauca, Sieb.). x 250. 
Fig. 29. Terminal wall of a tracheide from the wood of C. sp., showing 
transition from bordered pits to ladder-like perforations, x 250. 
Fig- 3 °- Longitudinal section through the large medullary ray in C. glauca, Sieb., 
showing the protoxylem-elements of the branch passing obliquely downwards to 
the pith. X335. 
Fig. 31. Terminal wall of a vessel from the young stem of Gnetum Gnemon, L., 
showing a single narrow perforation, x 250. 
Fig. 32. Terminal wall of a vessel from the primary wood of G.scandens, Roxb., 
showing a row of eight round perforations, x 165. 
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