FOSSIL PLANTS. 441 



blades and of the sporange-pedicels, as they appear when iso- 

 lated from the cone, is not recognizable, therefore its specific 

 relation is uncertain. 



The cone is figured as an illustration of the position of the sporange-cells on 

 their axis, to which they are perpendicular, and also of the form of the seeds. 

 These seeds, fig. 6 and 7, highly magnified, resembling those of a Lycopodium, 

 are exactly three one-hundredths of a millimeter in size, nearly round or slightly 

 tetrahedral, with valves discernible but without borders, and often agglomerated 

 by triplication, but separating easily. The absence of borders or wings on 

 these seeds indicates their maturity. They are easily detached from the spo- 

 ranges, like a brownish powder. The part seen at the top of the cone, and 

 represented enlarged in fig. 5, seems to be the support or the pedicel of a blade 

 or the scale of the sporange. 



In a concretion from Mazon creek. 



LEPIDOSTROBUS OVATIFOLIUS, Sp. nov. 



PI. xxx, fig 2 and 26. 



CONE about three inches long, one inch broad, with short, 

 erect blades; blade obtuse at its base, lanceolate obtusely 

 pointed, comparatively broad; pedicel of the sporanges short, 

 lanceolate. The axis of the cone appears to be narrow, a pe- 

 culiarity which does not agree with the shortness of the pedi- 

 cel of the sporange. As the detached blade, fig. 2 Z>, is copied 

 from another specimen which is crushed, and whose form is 

 unrecognizable, it may belong to a different species. 



In concretions from Mazon creek. 



LEPIDOSTROBUS OBLONGIFOLIUS, Sp. nov. 



PL xxx, fig. 3 and 36. 



A VERY fine specimen, also from the concretions of Mazon 

 creek, representing an exact cross section of a cone. The 

 central axis is one line broad, the blade one inch long, its 

 breadth one-third of the length, oblong, obtusely pointed, 



56 



