446 STRUCTURE AND AFFINITIES OF LEPIDOSTROBI. 



Fig. 3. Magnified view of the four somewhat distorted scars on the 

 surface of fig. 1. 



Plate 4, Fig. 1. Opposite surface of the fossil from that figured in 

 Plate 3, showing a large Lepidostrobus, whose base rests on the curved 

 crest of what was perhaps a branch supporting the cone. 



Fig. 2. Upper fractured surface of the fossil, showing the large 

 mature cone a, and a somewhat smaller one lying parallel to it. The 

 point, where lines, drawn from the daggers a and b would intersect, 

 indicates the position of the very perfect apex of one of the sporangia 

 which are arranged round the axis. 



Fig. 3 represents four scales (two restored) from the surface of the 

 cone a. 



Fig. 4. Sporangia chipped off the cone a. 



Fig. 5. Magnified view of a sporangium, restored according to the 

 appearances presented by the apex of the sporangium of the smaller 

 cone seen in fig. 2. 



Plate 5. Vertical sections from the Lepidostrobus figured in Plates 3 

 and 4, taken through the axes of the cones. 



Fig. 1. A vertical section taken from the cone, Plate 4, figs. 1 and 

 2 a, in the direction of the dagger a, cutting through the axis and por- 

 tions of several sporangia on either side. The axis retains hardly a 

 trace of organization beyond a little cellular tissue on its outer margin. 

 There are no remains of the bases of the scales supporting the spo- 

 rangia, which were once inserted into the axis. The sporangia are 

 large and long, occupying nearly the whole semidiameter of the cone, 

 and slightly curved, with the convexity upwards, as shown at Plate 4, 

 fig. 4. Their walls are of extreme tenuity, formed of a single row of 

 parallel cells (seen at Plate 6, fig. 4 c and 10), and they contain the 

 spores. 



Fig. 2 is a magnified view of some of the tissues of the walls of the 

 sporangia b, and the vascular tissue of the scales a, the latter composed 

 of tubular vessels which communicate from the apices of the scales and 

 the axis of the cone. 



Fig. 3 shows the dorsal portion (that nearest the axis) of a sporan- 

 gium, whose position is indicated by the intersection of lines drawn 

 from the daggers a b, of fig. 1. Towards the back of this are seen 

 numerous spores from the opaque mass which fills the greater part of the 

 sporangium. 



Fig. 4 is a portion of the same, so magnified as to define the 

 spores. 



Fig. 5. Dorsal portions of two other sporangia, indicated in fig. 1 by 

 the daggers b c, between the bases of which some escaped spores are 

 enclosed in a transparent mineral x. 



