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vertically, and thus forming a kind of discoid pith somewhat 
similar to that noticed by the late Professor Corda, and after- 
wards by Professor W. C. Williamson, F.R.S., in a paper pub- 
lished in vol. ix., second series, of the Society’s memoirs* This 
pith in the present specimen appears to be separated from cer- 
tain lunette-shaped bundles of hexagonal tubes of large size, 
arranged in a convex form towards the pith inwards, and 
lessening in size as they pass outwards into wedge-shaped 
masses of four-sided subhexagonal cellules arranged in radia- 
ting series and divided by large medullary rays or bundles 
which appear to originate in the lunette-shaped masses. On 
the outside of this internal radiating cylinder are other 
lunette-shaped bundles similar to those in the inside pre- 
viously described and also with a convex outside. Then 
comes a narrow zone of lax tissue which has been a good 
deal disarranged. Outside this are some thin wedge-shaped 
bundles of cellules full of dark carbonaceous matter, and 
arranged in radiating series of varying sizes separated by lax 
tissue probably representing the bark of the tree. 
In the longitudinal sections the cellules are seen to be 
greatly elongated and divided with oblique and transverse 
dissepiments placed at great distances. Two of the walls, 
namely those facing the medullary rays, are regularly reti- 
culated with six, seven, and eight series of hexagonal areolae 
arranged contiguously but not in a line. 
In the tangential section the walls of the cellules also show 
a reticulated appearance something like that previously 
noticed, but not in so marked and distinct a manner, and the 
medullary rays or bundles in their section show numerous 
irregular series of small cellules of one to four, and more 
rarely much larger cellules. 
The arrangement of the lunette-shaped bundles next the 
pith reminds us of similar masses described by Brongniart as 
occurring in his Sigillaria elegans , but the cellules in my 
specimen are much more irregular in size than those of 
