4 



Hind — Notes on the Komotaxial Equivalents, ^t. 103 



the Pendleside series in Staffordshire, and somewhere near Burnley, 

 probably below the Millstone Grits ; and I regard the fossil as of zonal 

 value. 



Everywhere where the beds which lie immediatelj' above the 

 Carboniferous Limestone are seen, a definite change of fauna is found 

 in the upper beds ; and the following species occur for the first time 

 in the sequence : — 



ChcBnocardiola Footii. G. reticulatum, 



Fterinopecten 'papyraceus. G. Favisi. 



Fosidoniella loivis. Fimorphoceras Gilhertsoni. 



F. minor. F, discrepans, 

 Glyphioceras diadema. Nomimioceras spirorhis. 



G. diadema var. with large umbilicus. 



This fauna is well known, occurring as it does at Chokier, 

 Belgium, in beds which are below the Coal Measures, aud must lie 

 close above the Vise limestone. 



It is of great importance to note that, both in County Clare and at 

 Chokier, Glyphioceras diadema is accompanied by a peculiar varietal 

 form, with very large umbilicus, strong and often bifurcating ribs, 

 and broad narrow whorls. 



I have been fortunate enough to obtain specimens of each form 

 exposing the sutures, and have submitted them to Mr. G. C. Crick, of 

 the IS'atural History Museum, who writes me that he can only make 

 them both to be G. diadema. 



We also know that a similar fauna occurs in England in the 

 Midlands, in beds which I have shown to occupy a definite position 

 between the Mountain Limestone and the Millstone Grits, and which 

 are here considerably thicker than they are in County Clare, reaching 

 1000 feet in thickness. 



At the base of this series in England is a bed of Frolecanites 

 compressiis and Fosidonomya Fecheri, with some zaphrentoid corals ; 

 and I should expect to meet with these fossils in County Clare 

 immediately below the G. diadema beds ; but at present I have not 

 been able to obtain these fossils in County Clare. F. Fecheri occurs 

 in County Dublin and County Meath with a similar fauna, and not far 

 from the same horizon, so that I hope some day to meet with these 

 fossils in County Clare, and merely give my opinion that they will be 

 met with below the G. diadema beds. 



In the paloeontological notes contained in the Explanatory Memoir 

 to sheets 91 and 92 of the 1-inch maps, p. 23, Baily, speaking of the 



