THE GEOLOGIST. 
17 
Lloydii, and the seed vessels Parkia decipiens, so well known 
in the Old Red of Scotland. We have not done with the 
Eurypterus yet ! At the very summit of the Conistones, high up 
on Rowlestone Hill, near Abergavenny, the Eurypterus has again 
been found, and these beds are two thousand feet or more above 
the Kington Tilestones.* 
Let us now turn to the evidence afforded by the fishes of this 
remote epoch. We have already seen tliat the Ouchus Murchisoni 
was contemporaneous with the Crustaceans that existed with the 
Comstone fishes, and we know that the lowest Old Red strata of 
Scotland, contain their wing-finned fishes, the Ptericthys, and that 
these beds are considerably lower than Scotch strata, which envelope 
the Cephalaspis Lyellii, &c., so that we may very fairly argue, that 
the Ptericthys was contemporaneous with the fishes of the 
Tilestones, and with the Onchus Murchisoni. 
Now in Scotland, the Ptericthys has been found in the Yellow 
sandstones, at the summit of the Old Red, and the base of the 
Coal measures ; and near the Clee Hills, in Shropshire, Mr. Baxter, 
of Worcester detected a specimen in good preservation, in yellow 
sandstone, below the Mountain limestone, and the equivalent 
as regards age, of the Dura Den beds of Scotland, and the 
Cyclopteris sandstones of Ireland. Immediately above the 
Ptericthys beds of the Clees, the Mountain limestone is crammed 
with the palates and scales of Carboniferous fishes, and the yellow 
equivalent sandstones of Ireland and Scotland supply us with the 
Carboniferous fish, Holoptychius, and even the remains of 
Megalicthys. Indeed the Geologists of the Irish survey, with Mr. 
Jukes at their head, argue, and most fairly, that these yellow 
Cyclopteris sandstones are Carboniferous rather than Old Red 
deposits, nay, even that the so-called Old Red conglomerate is a 
Carboniferous conglomerate, forming the base of the Carboniferous 
deposits. 
Here arise two interesting questions ; where can the Geologist 
point out a section in all our English district, where the " brown 
stones " (Upper Comstones) are to be seen passing conformably 
into the Old Red conglomerate ? and where, as regards Palseon- 
* See Edinburgh New PhQ. Journal, October, 1857, p. 257. 
D 
