F. IV. Oliver— 1 
beginning of February, when the gathering was made, the plant 
was exposed some months earlier than usual, and this no doubt 
accounts for our having been fortunate enough to meet with so 
conspicuous a growth. 
DESCRIPTION OF FIGURES ON PLATE I. 
Illustrating Miss G. LiSTKu’S Paper oil Tristicha altcrnifolia, Tul. 
Fig. 1. Group of six leaf}- shoots and a bud arising from the margins of a 
broad creeping stem on which are scattered small scale-like 
leaves; one shoot lias distinctly Distichous leaves; below are 
several broken roots; one to the right shows an old scar and from 
this a new root has grown out. x 0 . 
Fig. 2. Apex of leaf showing eleven siliceous bodies, seven on the upper, 
three on the lower surface, and one in a marginal cell: three 
short cells are drawn containing granular protoplasm and without 
siliceous bodies, x 170. 
Fig. 3. Siliceous body from a leaf that has been treated with chromic 
acid, x 030. 
ON THE IDENTITY OF SPOROCARPON 
ORNATUM, Williamson, and LAGENOSTOMA 
PHYSOIDES, Williamson. 
I N his 10th Memoir On the Organisation of the Fossil Plants of the 
Coal-Measures' the late Professor Williamson described and 
figured a transverse section of a small undetermined object from 
Halifax which he named provisionally Sporocarpon ornatum. His 
figure shows a circular cavity enclosed in a parenchymatous 
investment, the latter having an undulating peripheral boundary. 
Each of the nine or ten projections of the envelope bears “ a cluster 
of very large thin-walled cells, most of which are prolonged 
radially. 3 ” In his 13th Memoir 3 he figures a similar section from 
’Phil. Trans. 18 S 0 , p. 510 , and PI. xviii., Fig. 39 . 
2 loc. cit., p. 511 . 
3 Phil. Trans. 1 SS 3 , p. 469 , and PI. xxxi., F'ig. 27 . 
