FOSSIL PLANTS. 
417 
Hymenopiiyllites thallyformis, Sp. HOY. 
PL xvi, fig. 3 to 5. • 
The specimen here figured, represents only part of a frond, 
which, in its whole, appears to have been large and round¬ 
ish in outline, with undulate borders and undulate rugose 
hairy surface. From the emarginate border of the frond, pro¬ 
trude cylindrical branches, either erect or creeping, whose 
form is totally different from that of the frond. These 
branches, half an inch thick, are covered with ob-lanceolate, 
obtuse scales or leaves, narrowly striate, as marked, fig. 4, en¬ 
larging upwards and closely imbricate. As the scales are 
mostly crushed upon each other, it is not possible to see if these 
stems are fruit-bearing, like the branches of a Lycopodium, or 
are merely the base of the stems of some fronds of ferns, and 
thus only a different representation of the same organs of the 
plant. The specimen is good, the various parts of the plant 
are distinct, and the connection between the branches and the 
frond is evident. 
This kind of development may be compared to that of the Marchantiacese and 
of the Lt/cojjodiaceas with the fronds of the first, and the fruiting-stem of the 
last family of plants. I suppose that the fragment, represented fig. 5, belongs 
to the same species. It is apparently the plant in the first development of its 
frond. The specimen, fig. 5, is in a concretion from Morris; the other is on 
shale from Colchester. The same species has been found also on the shales 
from Morris. 
Hymenopiiyllites Strongii, Sp. nov. 
PI. xviii, fig. 1. 
Stem half an inch broad, erect, undulately veined or stri¬ 
ate in its length, bearing alternate leaves ? covered with long 
thick hairs or scales, diverging all around. It is not possible 
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