ENDOGENITES. 163 
me with the loan of a thin section of a stem of Clathraria, 
in which the bundles of vas- | von 
cular tissue in the petioles 
appear to be made up of 
spiral vessels. From what 
has been advanced, it is ob- 
vious that these remarkable 
plants of the Wealden flora 
were gymnosperms, closely 
related to the Cycadeee. 
Vestiges of roots, seed- 
vessels, and panicles, have 
been found in the Wealden, 
i i Lien. 57. 
which pd possibly belong CLATHRARIA LYELLIT; 2 nat. 
to the Clathraria > but the Specimen. showing the water-worn 
evidence as to their presumed external surface. 
relationship is at present too vague to require further 
notice. 
Enpocmnires erosa.—(Geol. 8. E. pl.i.; Lilg. Foss. pl. 
i. ; and by Dr. Fitton in Geol. Trans. vol. iv.).—The genus 
Endogenites was established by M. Ad. Brongniart for the 
reception of those fossil stems and woods, whose internal 
structure is endogenous, but which are too imperfect to be 
referred to any particular family. In this category must 
be placed certain silicified stems having a carbonaceous 
cortical investment, which I discovered in the strata of 
Tilgate Forest, in 1820. 
These fossils often occur in the layers of lignite which tra- 
verse the clay-beds in some parts of the Weald of Sussex. 
They are from one to eight inches in diameter, and five or six 
feet in length, and of very irregular shapes; I have not ob- 
served any indications of branches. Some Specimens are sub- 
cylindrical in the middle, and gradually taper to a point at 
each end; others are of a depressed clavated form, like some 
of the Cacteze or Euphorbiacee, They are generally silici- 
