421 
and parts of different species of pines, of tithymals, cereuses, &c. ; 
of large reeds, and of some arborescent plants*. His account is 
accompanied by engravings, tbe descriptions of which are neces- 
sarily very short. His first figure is of an impression of a plant 
with rhomboidal work on it, with which three long narrow leaves 
were found, which appeared to belong to it. This specimen was 
from Oswestry, in Shropshire ; a similar figure is given by Volck- 
man, in his Silesia Subterranea, Tab. XXII. Fig. 2. ; and it seems 
to resemble that described in Dr. Woodward’s Catalogue, B. 107, 
q. 22, q. 32, p. 106. The second and fourth seem to be of the reed 
kind, having knobs placed in rows on their surface, like the vesicles 
of some species of the rushes. This specimen seems to have been 
similar to one described by Dr. Woodward, B. a. 1, p. 9- The third 
impression he supposes to have derived its figure from some plant 
of the fir kind. The fifth specimen is from Mostyn Colliery, Flint- 
shire : its surface, when attentively viewed, exhibits a reticular 
impression of mesh-work, or rhomboidal hollows ; the sides of the 
rhombs, or the net-work, being raised in relief. In Plate I. Fig. 6, 
you will find the representation of a similar specimen from France ; 
and serves as an instance of the peculiarity of surface these im- 
pressions frequently possess. The appearance here so varying, with 
the change of light, as hardly to admit a fair representation of the 
proteal Surface; the artist, with every exertion, was not able to 
Lceed to his wish in this respect ; since although in some points 
of view the rhomboidal form would appear, m most others the 
transition into somewhat of an oval appearance would be discover- 
able. In the centre of these projecting bodies, small holes are 
observable, being such as might be expected for the insertion o 
setee, or of setaceous leaves. In the sixth of Mr. Da Costa s spe 
cimens, studs, apparently also for the insertion of setas, are regu ar y 
* Philosophical Transactions, Vol. L. Part I. p. ~28. 
