448 STRUCTURE AND AFFINITIES OF LEPIDOSTROBI. 



Fig. 5. Vessels seen at fig. 4 b, as they ascend towards the apices of 

 the scale, fig. 4, and are consequently cut across by the lapidary. 

 These vessels are figured at Plate 5, fig. 2 a, and Plate 8, figs. 6, 7, 

 and 11 a. 



Figs. 6 and 7. Portions of the crystallized cellular tissue of the axis 

 of the cone, fig. 1 a, in which the circular holes, a, indicate the position 

 of the vascular bundles supplying the scales, which are vertically sliced 

 in Plate 5, fig. 11 c. 



Figs. 8 and 9. Magnified portions of the small mutilated cone, 

 fig. 1 b, showing the positions of the spores which are retained in the 

 young cone, but of which there are no traces in the large cone, fig. 1 a. 



Fig. 10. A portion of the walls of a sporangium, cut obliquely by a 

 horizontal line, so that at one portion, a, the lateral cells are divided 

 according to their long axis, whilst at the other, b, the cells forming the 

 floor, are cut across their short axis. 



Fig. 11. Ripe spores from the small cone, fig. 1 b, one of them, a, 

 divided into four cohering sporules. 



Fig. 12. Other spores more advanced, a, ready to separate ; b, the 

 sporules detached from one another ; 3, a sporule detached wholly, pro- 

 bably in a state once ready for germination. 



Fig. 13. Horizontal section of another part of the cone figured at 

 Plate 3, fig. 2. This is crushed on one side, but tolerably perfect on the 

 other, and there displaying some ripe sporangia, with a few spores in 

 each. 



Fig. 14. Magnified view of the axis. 



Fig. 15, Portions of three sporangia, with a few spores scattered at 

 their bases. 



Fig. 16. More highly magnified view of portions of these sporangia 

 and their contained spores. 



Fig. 17. Spores from the same, in various stages of development. 



Fig. 18. Some spores very highly magnified, all young, and the com- 

 ponent sporules not only separated, but bounded by a transparent space, 

 and the whole surrounded by a jagged border, probably the effect of 

 crystallization. 



Plate 7, illustrates a beautiful specimen of Lepidostrobus ornatus, 

 preserved in a nodule of iron-stone. The specimen is from Glamor- 

 ganshire, is preserved in the Bristol Museum, and liberally placed 

 at the service of the Survey, not only for illustration, but for slicing, 

 by Mr. Stutchbury, with the approbation of the directors of that 

 institution. 



Fig. 1. Lepidostrobus ornatus, Lindl. and Hutt., of the natural size. 



Fig. 2. Vertical slice, taken through the axis, showing that the apex 

 is undeveloped, and the cones hence hardly mature. 



