246 SILTJK1A. [Chap. XI. 
1 Silurian System ') have since been added. Many others will be noticed 
in describing the Scottish series. 
The lowest Old Bed strata in which I had personally observed the re- 
mains of the peculiar Fish Cephalaspis when the first edition of this work 
appeared are at the western slope of the Silurian ridge of May Hill *. In 
examining the cuttings of the Ross railroad, near Flaxley, my lamented 
friend Mr. H. E. Strickland f and myself detected a fragment of that 
Ichthyolite in the very bottom beds of the Old Eed, which, containing also 
certain land Plants, there lie in apparent conformity upon the uppermost 
Ludlow rocks. 
More recently, indeed, the sections near Ludlow, particularly on the 
right bank of the Teme, have afforded those fresh evidences of a transition 
from the Upper Ludlow into the Lower Old Eed which have previously 
been adverted to (p. 139), and which render it difficult to draw any arbi- 
trary line (within a few yards at least) as an horizon to separate the two 
formations % . In Shropshire we find, in ascending from the Tilestones into 
the marls and sandstones with concretions of argillaceous limestone (and 
the same phenomenon reoccurs near Kington in Herefordshire), that other 
species of Pteraspis occur, as well as other species of Cephalaspis, and par- 
ticularly C. Lyellii ; and thus we are conducted at once into the great for- 
mation which, in parts of Scotland, also contains the same species. 
In the red ground two miles north 
of Bewdley, near Trimpley, in Wor- 
cestershire, greyish sandy grits and 
cornstones rise out in undulations. 
There the cornstones are charged 
with Cephalaspis Lyellii and Pter- 
aspis Lloydii, and the underlying grits 
with P. Banksii, Pterygotus Ludensis 
and eggs of this Crustacean (Parka de- 
cipiens), &c, with many remains of 
Plants, including the small Lycopo- 
diaceous sporangia (Pachytheca). 
An important addition was not long 
since made to the fauna of the Old 
Eed Sandstone of England by the dis- 
covery of a Eurypterus at Eowlestone 
in Brecknockshire, in the lowest portion of those sandstones of the Black 
Mountain, near Hay, which overlie the cornstones, d, of the previous gene- 
* See Sil. Syst. pi. 36. f. 13. sciences of which he was so great an ornament. 
t The passage of this portion of the first edition The correction of those pages by his hand, during 
of this work through the press having been delayed my absence, was one of the last memorials of a 
until I returned from a tour in Germany, I learned friendship which I truly cherished, 
with profound grief, upon my arrival, of the la- J Another very interesting section of these 
mentablc catastrophe by which, in examining an- Passage-beds, at Linley in Shropshire, has been 
other railroud-cutting, my eminent friend, Mr. H. described by Messrs. G. E. Koberts and J. Kan- 
K. Strickland, had been taken away from those dall (Quart. Journ. Geol. Soc vol. xix. p. 229). 
Fossils (69). Crustacean prom the 
Old Bed op Herefordshire. 
Stylonurus Symondsii (Eurypterus, 
Salter, Quart. Journ. Geol. Soc. vol. xv. 
pi. 10. fig. 1); from Rowlestone, south of 
the Hay, Brecknockshire. 
The cephalic shield of a Crustacean 
allied to Pterygotus. For figures of this 
and other species of Stylonurus, see Mr. 
H, Woodward's paper in the Quart. 
Journ. Geol. Soc. vol. xxi. p. 482. 
