90 DESCRIPTIVE CATALOGUE 



much weathered out and shows the annual rings very 

 clearly, while the other end is cut and the regular 

 zones of wood can be seen, as in PI. Ill, fig. 1. The 

 wood is considerably teredo-bored, and the borings are 

 filled with coarse granular matrix. The petrified 

 tissues are dark brown, the petrifying medium is 

 partly silica and very close-textured, and the tissues 

 are beautifully preserved. 



V. 4859 a. Figured, PI. Ill, figs. 1, 2, & 3. Transverse section 

 from the above, showing all the features of the pith, 

 primary wood and secondary rings of wood well pre- 

 served and as described above in detail. The broad 

 zone of autumn wood is very noticeable, and in almost 

 all of the wood-rings are to be seen the small vertically 

 running resin-canals. 



V. 4859 b. A thicker section like the above, but somewhat 

 broken in the cutting. 



V. 4859 c. Figured, text-figs. 17 & 18. A transverse section 

 similar to the above. In it all the features described 

 for the type can be seen. Resin-canals from different 

 parts of the section show their detailed structure very 

 clearly and are exceptionally well preserved. 



V. 4859 d. Figured, text-fig. 21. Eadial long-itudinal section 

 of the above, passing through the pith, the short 

 oblong cells of which are well seen. The pitting of 

 the radial walls of the medullary ray -cells can be 

 made out in some places, though not in all the rays. 

 The end-walls of the ray-cells can also be seen, and 

 they slope at a low angle or are curved. 



V. 4859 e. Another radial section similar to the above, but 

 thicker. Parts of it are cut tangentially, and a small 

 branch can be seen coming off. 



V. 4859 f. Figured, text-fig. 20. Radial longitudinal section, 

 thick and rather opaque in parts, but in one or two 

 places it shows the " abietinean pitting " of the walls 

 of the medullary ray-cells very beautifully, as is 

 illustrated in the text-figure. 



