264 Comparative Anatomy of the Casuarineae . 
Fig- 33- Terminal wall of a sieve-tube from the phloem of Gnetum scandens , 
Roxb., showing a large number of sieve-plates scattered over it. x 250. 
Fig. 34. Portion of a sieve-tube from the same plant, showing the region of the 
sieve-plates. X120. 
Fig- 35- Terminal wall of a vessel from the primary wood of G. Thoa, R. Br., 
showing a long narrow perforation still divided into two by a transverse wall, 
x 165. 
Fig. 36. Terminal wall of a vessel from the internode of G. paniculatum, Benth., 
showing three perforations, of which the upper one can be clearly seen to be 
derivative from two. This is an earlier stage than Fig. 35. x 250. 
Fig. 37. Terminal wall of a vessel from the node of G. paniculatum ^ Benth., 
showing a double row of round perforations, x 250. 
Fig. 38. Terminal wall of a vessel from the internode of a young stem of 
G. Gnemon , L., showing a transitional stage between the double and the single 
row of perforations. X250. 
Fig. 39. Terminal wall of a vessel from the region between the node and inter- 
node, showing the irregular mode of fusion of the perforations in G. paniculatwn , 
Benth. xj65- 
Fig. 40. Terminal wall of a vessel close to the node, showing a variety in the 
arrangement of the perforations in G. paniculatwn, Benth. x 165. 
Fig. 41. Terminal wall of a vessel from the wood of Ephedra , showing the 
double row of perforations, and three bordered pits at its extremity, x 250. 
Fig. 42. Transverse section through a bundle of the leaf of Ephedra , showing 
two transfusion-elements at its edge (tf). x , xylem ; ph , phloem ; ins , mesophyll. 
X250. 
Fig. 43. Terminal walls of three vessels occurring next to the protoxylem ( px ), 
from a twig of Carpinus, showing the mode of perforation in these first-formed 
elements, x 250. 
Fig. 44. Terminal wall of a similar vessel isolated, x 250. 
Fig. 45. Terminal wall of a tracheide from the wood of Corylus, showing a 
transitional stage between bordered pits and ladder-like perforations, x 250. 
