OF LOWER GRKENSAND PLANTS. 



133 



of those ovules which are cut across in the middle for example, 

 end. in PI. XI, figs. 1 & 2, shows this quite clearly, particularly 

 if examined with a lens. This central space is indicated in the 

 text-fig. 32, e. The ovules were inverted, lying with their 

 micropyles directed towards the cone-axis. This is indicated 

 on the right-hand side of PI. XI, fig. 2. Some of the ovules are 

 cut nearly in median longitudinal section, and in them the 

 nucellar tissue and the massive free tip of the nucellus can he 

 seen, as is indicated in text-fig. 33. In these sections the 



Text-fig. 33. Pinostrobvs Benstedi (Mantell). Outline sketch of ovule in 

 slightly oblique longitudinal section showing : m., micropyle; s., space 

 between integument i. and the free upper part of nucellus n. ; 

 e., inner broken-down tissue of the incompletely developed endosperm. 

 No. 39107 a. 



tissues are all fairly well petrified, and demonstrate the 

 immaturity of the cone. 



AFFINITIES. So far as I am aware, no fossil cone so well 

 petrified, similar to this or in the same young stage of its 

 development, has been described. On the other hand, a con- 

 siderable number of abietinean cones, externally more or less 

 like it, have been recorded from the Cretaceous and Tertiary 



