23 
beds in this quarry one or two specimens of Pteraspis 
i Ludensis have been found. 
At the upper end of the section in Ludford Lane I 
have obtained several fragments oiHomalonotus Knightii 
and Conularia Sowerbyi . A little lower down the lane 
is the famous Ludlow bone bed, until lately considered 
to mark the dawn of vertebrate life; it is almost entirely 
composed of fish and crustacean remains. On this 
horizon we first find relics from the land, in the shape 
of small seeds or spores of some cryptogamic plant. 
About a foot below the bone bed Eurypterus pygmceus 
and acuminatus occur, and immediately above is a layer 
of very thin bedded stone full of fragments of Pterygotus 
Banksii; a little higher up the rock is the Platyschisma 
helicites bed, in which several masks of either Pteraspis 
or Cepalaspis have been found. I consider this bed as 
the line of demarkation between the Upper Ludlow and 
Downton sandstone. Many other fossils may be found 
here, such as Beyrichia Klodinii , Lingula minima , 
Holopella obsoleta , Cucullella antiqua , Spirifer elevatus , 
and Orthoceras tracheale. The Downton sandstone is 
exposed at the lower end of the lane, resting conform¬ 
able upon the underlying rock ; it is in general a very 
barren formation, and for that reason has received but 
little attention from geologists. It contains little else 
in this neighbourhood than fucoidal and carbonaceous 
impressions, and a very abundant small Lingida ( cornea ); 
still it is worth examining, as several fish-heads and 
large portions of Pterygotus have been collected from it. 
Walk No. II. 
A little distance through the Turnpike Gate, near to 
the New Bridge, is a large Upper Ludlow quarry, 
containing an abundance of fossils, and as it is often 
worked, there is generally a quantity of loose stone in 
