Barber . — Cupressinoxylon vec tense. 361 
distichum and Thuja gig ante a may be distinguished from 
all others by the thick pitted transverse walls of these cells. 
The reticulated pitting on the tangential walls of Thuja 
gig ante a and Fitzroya patagonica is also considered a good 
character. 
EXPLANATION OF FIGURES IN PLATES 
XXIII AND XXIV. 
Illustrating Mr. Barber’s paper on Cupressinoxylon. 
Fig. 1. Transverse section of branch (i) of Cupressinoxylon vectense , showing 
composite rings, x 3}. 
Fig. 2. Transverse section across composite ring of a branch — the same specimen 
as in Fig. i — showing gradual and sudden transitions between the large and small 
elements, x 60. 
Fdg. 3. Transverse section across part of a root, x 30. 
Fig. 4. A partial ring which disappears completely to the right, x 30. 
Fig. 5. Part of the medullary sheath of branch (1). The rows of tracheides 
terminate towards the pith in small-celled groups. This is better seen in the portion 
more highly magnified in the next figure, x 45. 
Fig. 6. Part of the medullary sheath shown in Fig. 5, more highly magnified, 
x 100. 
Fig. 7. Pith of root (2). The rows of tracheides pass uninterruptedly into the 
pith. There is no appearance of the groups of small cells representing the pro- 
toxylem. x 100. 
Fig. 8. Resiniferous parenchyma in radial section with drop-like masses of fossil 
resin, x 350. 
Fig. 9. Resiniferous parenchyma in tangential section, x 350. 
Fig. 10. Tracheide showing the occasional doubling of the row of bordered 
pits, x 500. 
Figs. 11 and 12. Walls of tracheides in tangential section showing the cavity 
of the pits with suspended torus, x 500. 
Fig. 13. Radial section through part of the summer- wood of a composite ring 
with the torus preserved as sharp dark lines. All stages are met with, frequently 
near together, between the appearances in Figures 11, 12, and 13. x 500. 
Fig. 14. Resiniferous parenchyma in tangential section. The dark oval bodies 
in the walls appear to be small double-bordered pits, x 800. 
Fig. 15. Various appearances presented by bordered pits in surface view, 
probably depending upon the state of preservation, x 750. 
