308 Prof. Sedgwick on the May Hill Sandstone, 



Fossils of the Pentamerus limestone and May Hill sandstone of 

 Linley and Norbury, 



First of all, we may remark that we have, especially in some 

 of the upper beds, the Pentamerus oblongus and the Pentamerus 

 lavis in infinite abundance. Here, indeed (as I believe also at 

 the Hollies and other well-known localities), they seem to have 

 in a great measure supplied the calcareous matter of the lime- 

 stone. But in addition to these two abundant fossils, and after 

 rejecting many specimens which were too imperfect to give secure 

 results. Prof. M'Coy determined the following species, the list of 

 which is here given in his own words : — 



'* Ptylodictya lanceolata (as at Dudley). 



Palaopora interstincta (common to Cambrian and Silurian 

 rocks). 



Favosites multiporatus (do.). 



Petraia bina (as in Wenlock limestone and May Hill sandstone). 



P. bina, an unnamed species (same as at May Hill). 



Encrinurus punetatus (common to Cambrian and Silurian 

 rocks). 



Lepttjena transversalis (as in the Wenlock limestone of Wool- 

 hope, Dudley, and in the May Hill sandstone). 



Leptana euglypha (Wenlock limestone and Dudley limestone). 



Orthis elegantula (common to Cambrian and Silurian rocks). 



O. pecten (do.). 



O. Davidsoni (Wenlock limestone of Walsall and May Hill 

 sandstone). 



Spirigerina reticularis (Cambrian, Silurian and Devonian). 



Littorina Octavia (same as in Wenlock limestone) .^^ 



Upon this list I may remark, that out of fifteen carefully de- 

 termined species, eight have not yet, so far as I have heard, been 

 found except in the Wenlock group or its equivalents ; and that, 

 of the remaining seven species, one ranges up to the Devonian 

 rocks inclusive. The remaining six belong to species which were 

 already known to be common both to Cambrian and Silurian 

 rocks. And lastly, that all those very abundant types, which 

 have hitherto been found exclusively in the Bala and other un- 

 doubted Cambrian groups, are here entirely wanting. We found 

 no other examples of species common to Cambrian and Silurian 

 rocks. But we wepe by no means surprised to find several well 

 known common species in a deposit which is at the base of the 

 Wenlock shale. It is the exact locality where we should have 

 expected to find such species. 



By itself, this evidence might not be considered sufficient to 

 prove that the Norbury group is to be cut off from the Caradoc 

 sandstone, and arranged with the May Hill sandstone. But 



