548 ON THE PALROZOIC DISTRICTS OF WEST SOMERSET. 
Discussion. 
Prof. SreLEy said he had examined the district some years since, 
rather carefully, and wished to ask Mr. Ussher a few questions. 
He himself thought he had made out the sequence and mineral 
structure of the beds, as he did not think the distinctions already 
established could be always identified; he also demurred to the 
faults mentioned by the authors. Fossils are rare in many parts of 
the series. He wished therefore to know on what authority the 
authors had made their divisions. 
Mr. Wixwoop said he knew the country, and had found many 
fossils in places where Prof. Seeley said he had not found them. He 
described various localities and the results of his examination. 
Mr. Ussurr stated that he had traced the subdivisions, both by 
feature and by lithological character, over an area exceeding 300 
square miles, and that the faults were well founded. 
