[MATTHEW] ON SOME NEW SPECIES OF DEVONIAN PLANTS 193 
where the plant is preserved in sandstone and sandy shale, but in fine 
clay shales most of the stems are quite smooth; may it not be that th> 
ribs on the stems of the plants of this genus are due to the contraction 
of a smooth-stemmed but somewhat succulent plant in a mould of sand, 
while the examples preserved in clay have yielded more quickly to pres- 
sure, and thus have been evenly flattened; this smooth flattening is 
found in the softer and less woody tips of the twigs of P. Ellsi, evan 
when the stouter part of the twig is ridged. 
This plant resembles P. princeps, Dn., but appears to be a distinct 
species rather than a variety; it is smaller and more bushy, and the 
peculiar habit of the ultimate branches of flattening out into a straight, 
ribbon-like leaf or succulent tip is not shown by Sir William Dawson 
for any of his species, nor represented in his figures. 
There are occasional pieces of broad leaves or rhizomes (an inch 
wide) occurring with this species; these are minutely, longitudinally 
striate, and may belong to a Cordaites, or they may be the rhizomes of 
this plant, and similar to the rhizomes which Sir William has described 
as occurring with P. princeps, but I have found no areoles on them. 
LEPIDODENDRON. 
The Hartt material from Gaspereau presents peculiar difficulties in 
the determination of the species of this genus, owing chiefly to the 
variability of LZ. corrugatum. Sir William Dawson put all that he 
described and figured from this localtiy in one species, that named 
above, but the material collected by Prof. Hartt which I have, may 
be referred to several species, some of which I have named in the fol- 
lowing summary. I prefer, however, to leave the full determination 
of these to a later period. 
ANEIMITES ACADICA, Dawson. 
This fern occurs in great abundance at Gaspereau, in fact, I did 
not find remains of any other in the Hartt collection, but the pinnules 
are all detached, so it is difficult to restore the frond: whether the 
arrangement of the barren pinnules is the same as that found in 
Triphyllopteris is at present uncertain. 
SUMMARY OF RESULTS. 
The Devonian Flora of the Gaspereau R., Horton Bluff and the 
Kennebecasis Valley. 
I couple these three localities together as both the stratigraphers 
and Sir William Dawson, who studied the plant remains, acknowledge 
