404 
THE GEOLOGIST. 
fruits occasionally met in the Lower Greensand beds, and which, 
if they belong to either class, are more like Pandanaceous fruits 
than Liliaceous. 
As I have found fragments of similar cavernous wood in the 
Greensand of Eolkestone, it is probable many more specimens may 
be by diligence obtained ; and my impression is, that a large tree 
I once saw split out like a picture on the surface of an enormous 
block of ragstone in Mr. Bensted's quarry was a nearly perfect 
specimen of the DraccBna Bensfedii, or whatever other genus this 
specimen may be proved to belong to. 
AVe have before drawn passing attention to some of the plants of 
the British cretaceous rocks, and we wish again to do so now. It is 
an unworked mine full of promise, and every labourer in it will meet 
reward. 
ON THE EESTOEATION OP PTEEASPIS. 
By the Eey. Hugh Mitchell, M.A. 
In the year 1860, when engaged in drawing 
up a list of the fossils known to occur in the 
Lower Old Eed Sandstone of Scotland, we had 
occasion to remark that, with the exception 
of the Pteraspis, we had found in our northern 
rocks the various fossils of the equivalent 
beds in England, and many others besides, 
indicating an extensive piscine fauna in that 
epoch of geological history. We have now 
to remove that exception, for Pteraspis does 
occur with us. Some very fine specimens 
have recently been found in our Scottish 
rocks, and from their examination we are not 
only able to discern that fragments which 
have been many years in our possession, and 
which we could not refer to any known fossil, 
belong to that palaeozoic fish, but we are also 
encouraged to attempt the restoration of the 
remarkable buckler, composed of solid bone, 
in which this ancient denizen of the deep was 
encased. 
Figure 1. In the construction of this dia- 
gram three fossil specimens have been em- 
ployed. These specimens are similar in their 
proportions and in the method of their pre- 
