416 
of this animal, except that I have used the term reptile. I 
may say, however, that I have minutely examined the feet of 
many recent reptiles, and have also made casts of some of 
them, and the result of my experiments is a firm conviction, 
that the tracks are those of either a small Lacertine, Saurian, 
or Batrachian. I am inclined to think the former. 
I believe no doubt can exist as to the genuineness of all 
the foot-prints I have been describing ; but I am fully aware 
of the great tendency which exists to speculate, and to draw 
conclusions from insufficient evidence, and I have, therefore, 
reserved until now a case in which the appearances are less 
conclusive. 
In the month of October last, (1841), while making a com- 
mon sewer in Holly- street, in this town, I observed a stratum 
of red sandstone, which is a somewhat uncommon occurrence 
among the Coal measures, and is conjectured by Professor 
Phillips to be form.ed from the detritus of the Old Red Sand- 
stone. It was suggested to me, that it might possibly be an 
out-lier of the lowest member of the New Red Sandstone form- 
ation ; but from its apparent connection with other strata of 
sandstones belonging indisputably to the Coal measures, I be- 
lieve the colour is a local appearance, communicated probably 
by the cause assigned by the Professor. 
I was induced, however, carefully to examine the stratum, 
and found a surface, upon which a layer of red marl had been 
precipitated. From my previous experience, I thought it 
likely that this might conceal some kind of foot-prints, and 
on removing it from the surface, I discovered a great number 
of depressions of various sizes, and of several forms. The 
workmen had to open but a narrow trench, and the stratum 
is very full of cracks and joints, so that I was unable to obtain 
very large specimens. The stone, as will be observed, is of 
an open grain, except in the indentations, where a smoothness 
is produced, as if by the soft cushions of feet pressing the 
