220 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



In the great development of the Sihirian rocks of Denbighshire we 

 lose, I believe, all traces of the Woolhope limestone ; and in many 

 parts of Westmoreland and Lancashire it disappears, with the other 

 Silurian limestones, entirely from among the older palaeozoic rocks. 

 Still it deserves remark, that in the range of the true Silurian rocks 

 of North Lancashire, from a part of Low-Furness to the foot of 

 Coniston-water, we find in several places the Coniston grits overlaid 

 by discontinuous beds of concretionary limestone, which, with my 

 present views (for I would, provisionally, identify the Coniston grits 

 with those of May Hill), I should not hesitate to bring into near 

 comparison with the Woolhope limestone. 



On the south side of May Hill the Woolhope beds are not merely 

 degenerate and concretionary, but they alternate with, and pass into, 

 a yellow soft decomposmg sandstone, which, here and there, contains 

 many ill-preserved fossils. In this way the beds in question seem to 

 form a distinct mineral passage into the upper beds of the central 

 dome of May Hill : and, by way of conclusion, I may remark, that 

 all the fossils of the group under notice were of Wenlock species, 

 without any admixture of those types which (using the nomenclature 

 of my former paper) are characteristic of the higher groups of the 

 great Cambrian series. 



Dismissing the Woolhope limestone, we next come to the great 

 central mass of May Hill. Its upper beds, which are of a very con- 

 siderable thickness, contain many well-preserved fossils. The lower 

 beds of the dome, which crop out as we advance towards its summit, 

 are more coarse, are sometimes very ferruginous, and here and there 

 become so coarse as to pass into a conglomerate. These lower beds 

 are ill-exposed, and we had very little time for their examination, 

 nor did we obtain from them one single fossil. But from the shelly 

 sandstones which form the south brow of May Hill, and descend 

 unequivocally under, and pass into, the above-mentioned Woolhope 

 beds, I am enabled to give the following list of fossils, obtained during 

 two visits, by the joint labours of Professor M'Coy, Rev. P. B. Brodie, 

 and myself. The names are, of course, given on the authority of 

 Professor M'Coy: — 



List of the May Hill Fossils, ^c. 



The letter (W.) is affixed to such species as are known in other undoubted 

 Wenlock localities. 



Petraia Una (W.). Pentamerus lens (Malvern). 



Palaocyeliis porpita (W.). linguifera (W.). 



Halt/sites catenulata (W.). Orthis turgida ? 



Favosites Gothlandica (W.). Davidsoni (W.). 



multipora (W.). hybrida (W.). 



Cornulites serpuloides (W.). Leptana transversalis (W.). 



Encrinurus punctatus (W.). Strophomena simulans? (Malvern.) 



Spirigerina reticularis (W.). funiculata (W.). 



Spirifera crispa (W.). pecten (W.). 



Hemithyris navicula (Ludlow). Leptagonia depressa (W.). 

 marginalis (W.). Euomphalus funatus (W.). 



" Of the above twenty-two species, nineteen are well known in the 

 undoubted Wenlock or superior strata of other districts, and are all 



