of Barrow in Leicestershire. 141 



At Wilmcote in Warwickshire there are indications of nu- 

 merous faults (which were lately pointed out to me by Mr. 

 Kershaw), in all directions round the district, more than are 

 generally supposed. Thus the ' firestone/ which is the lowest 

 and hardest stratum worked, crops-out at various points and 

 dips at a considerahle angle, on the higher ground ; and the 

 several bands of 'Insect limestone' and shale lie in a basin 

 formed by the outcrop of this lower bed. The ' Plagiostoma- 

 bed,' containing P. gigantea, Cardinia ovalis, and Astarte lurida, 

 occurs in places in its normal position ; but there appears to be 

 no trace of the underlying Saurian beds, which are of consider- 

 able thickness in Gloucestershire, and their absence is to be 

 noted both at Wilmcote and Barrow, which implies a great 

 thinning-out of the lower Lias in that direction. This holds 

 good, at all events, with respect to the lower Lias at the latter 

 place, where there are fewer bands of ' Insect limestone/ but at 

 the former they are more numerous, not less than eight courses 

 divided by thick shale ; and as the ' Insect-bed' in Gloucestershire 

 is often confined to one, or at most two layers, only a few inches 

 thick, the increased number of ' Insect-beds' in Warwickshire 

 may represent the ' Saurian beds' in Gloucestershire and other 

 places, with which they were perhaps coeval in point of time. 



The ' firestone' above referred to is a hard, crystalline lime- 

 stone, full of oysters and spines of Echini, from 3 to 7 inches 

 thick. In Warwickshire it always underlies the last bed of 

 ' Insect limestone/ but does not occur in Leicestershire. 



I have only seen two specimens of the large Eryon from Warwickshire, 

 one of which is in my own collection, and the other in that of my friend 

 Mr. Kershaw. I am indebted to his kindness for another fine but appa- 

 rently distinct species of this genus. 



The largest measures 6 inches in length from the top of the head to the 

 extremity of the tail, and a little more than 2 inches in breadth in the 

 widest portion of the body. 



