388 
THE GEOLOGIST. 
north-east to south-south-west, these stony masses appear to the 
artist like insulated Cyclopean ruins jutting out upon a lofty moor- 
land ridge, at heights varying from fifteen hundred to sixteen hundred 
feet above the sea. On reaching the summit of this barren height, 
the traveller sees below him, to the west, a rapid slope, and beyond it 
a picturesque hilly tract, the strata of which are laden with Lower 
Silurian fossils, and diversified by a variety of rocks of igneous origui. 
In short he has then within his view the original type of formations 
which, raised to greater altitudes, and effected by a slaty cleavage, 
occupy large mountainous tracts in Wales." 
In the outstanding bosses of the sihceous 
sandstone of the Stiper-stones, fragments 
of Lingulse have been met with, which, as 
well as their relative position with respect to 
the underlying and the superimposed beds, 
identify these strata with the true Ling-ula- 
flags of North Wales. 
In the Stiper-stone rocks Mr. Salter has 
also found anneHde-tubes, resembling, if not 
indeed identical with, Scolithus linearis, 
described by Prof. J. Hall, from the Potsdam 
sandstone ; and with waving undulations and 
ripple-marks in the flag-like beds ramose 
and twisted forms are found, amongst which 
casts of a so-called seaweed, the Cruziana or 
Bilobites, are said to occur. The scolithi 
are better known in the North American rocks 
than in our own ; we have therefore chosen 
our figure from a foreign specimen. 
The broken and contorted condition of the 
Lingula met with in the Stiper-stone strata 
renders it difficult to determine the species ; 
but there appears reason to doubt its being Lign. 5.— Scohtuus lineakis. 
, 7 Ti . ■■ J. ,1 ixr 1 1 J. J. -ii [From an American spocimGn]. 
the Jjingula IJavisii oi the Welsh strata, with 
which, however, it is well known some other forms, as yet un- 
described, occm- ; and with some of these it may be hereafter 
identified. 
