132 



DESCllIFIIVE CATALOGUE 



particularly noticeable if comparison be made with P. macro- 

 ceplialus, for instance, where a cone of about four times the size 

 has an axis only 5 mm. in diameter. The cellular tissue of 

 the axis is not very well preserved, but the outline of the large 

 soft cells composing it can be seen ; they appear to have been 

 slightly thickened, but not sclerised as the cells of a mature 

 cone would be. There are no transverse sections of the cone, 

 but from the longitudinal section it can bo recognised that in 

 the axis there was a slender hollow cylinder of vascular tissue, 

 giving off strands to the scales. A few small elements with 

 fine scalariform thickening can be seen, but the secondary wood- 

 elements are not well enough petrified to show the character of 

 their pitting. 



/v. 



Text-fig. 32- Pinostrobns Ben stcdi (Mantell Tangential section showing : 

 os., ovuliferous scale ; bs., bract-scale ; and o., the two ovules on the 

 ovuliferous scale. Somewhat diagrammatic : ., broken-clown endo- 

 sperm ; w., wing. X about 8. No. 30107 d. 



The scales are double, a large bract-scale bearing on its upper 

 surface an ovuliferous scale with two basal ovules on its upper 

 surface. In longitudinal section these can be well seen in 

 PI. XI, figs. 1 & 2, o., os., bs. These cone-sections are slightly 

 oblique, and so cut the upper scales almost in a tangential 

 direction, in which direction the relation of the parts is as in 

 text- fig. 32, which is drawn from a purely tangential section 

 of the cone. 



The ovules are far from mature, and the tissues of the endo- 

 sperm had evidently not yet quite fully differentiated at the 

 centre at the time of petrifaction ; the small irregular space left 

 by the breakdown of their walls can be seen in the photographs 



