338 
THE GEOLOGIST. 
little curious bivalved crustacean, Leperditia {marginata ?), are 
abundant on the surface of the shales. Here is also a fish-bed, ci-owded 
with tuberculated scales and spines of minute fishes {Pledrodus?). 
These beds are, in their turn, covered up by the tilestones. of which 
the upper series is finely exposed along the sides of Carve Dale, at 
Bouldon, Sutton, and l^orton. The latter place has lately yielded 
Pteraspides, of great interest, in the equivalent of the Trimpley-bed. 
Pteraspis Croucliii is a new form from this place, named in honour of the 
discoverer, the Eev. J. F. Crouch, of Pembridge. With the lower 
tilestones I had not time to make acquaintance, if they are exposed 
near Ludlow ; the " micaceous red marl " of the Geological Survey 
Map, marked as occurring on the South flank of Llanwen Hill (near 
Knighton), appears to belong to this series, and to be the equivalent of 
beds covering up Downton Sandstone at Abberley, (N. end of the hill), 
and, in my own neighbourhood, of the lowest tilestones exposed in the 
anticlinal ridge of Trimpley.* In this micaceous marl of Llanwen, 
I met with Ceratiocaris spines. It there rests against Downton 
Sandstone, of remarkably hard character, containing the usual fossils. 
Beneath the Ludlow " bone-bed," the Upper and Lower Ludlow 
Rocks are in the whole district, W. and S. "W. of the town, crowded 
with instructive fossils. The quarries at Whitcliff for the upper series, 
and Yinnal Hill for the lower, will aftbrd the collector a fine series of 
instructive forms. 
Through these we passed Burrington, where, in Wenlock shale, 
great numbers of Trilobites {Calymene tulerculosa, and Plumps 
eaudatus,) may be met with, enclosed in hard nodules. Unfortunately, 
they are not easy to split open, without damaging the fossils contained. 
Near the Bridge, PTiacops longicaudatus (which may be only the 
perfect P. eaudatus) is plentiful. For this, and other courteous 
directions, I am indebted to Mr. Marston, of Ludlow, who has devoted 
so much time to the district. Taking the lane for Whitton, a Lower 
Ludlow quarry on the right hand gave me some fairly-preserved 
remains of Ceratiocaris, with bifid tail j these spines, generally found 
separate from the jointed plates, have been variously regarded as 
ichthyic fin- spines, and crustacean pincers [Leptocliehs'). 
This bed, lying beneath the upper tilestone, there exposed, has been recently 
broken into on the crown of the hill. Ko fos^^ils of importance have yet 
Occurred. 
