﻿Vol. 64.] CAKBONIFEROUS LIMESTONE OF THE MIDLAND AEEA. 69 



two areas should be regarded as constituting a Midland 

 Province. 



(7) A comparison of the Dihunophyllum-Zone of the Midland and 

 South- Western Provinces, respectively, brings out the fol- 

 lowing more important differences : — 



(a) The brachiopod-fauna of the Lotisdalia-suhzone of the Midland 



Province is considerably richer than that of the equivalent part of 

 the South- Western sequence. 



(b) The Cyatkaxonia-suhzone of the Midland Province, which attains a 



maximum development in Derbyshire and North Staffordshire, is 

 practically undeveloped in the South- Western Province. 



In conclusion, I would express my thanks to those geologists 

 who have assisted me during the course of my investigations. 



I am indebted to Prof. Charles Lap worth for his valuable advice 

 and continual encouragement ; to Mr. H. H. Arnold-Bemrose, with 

 whom I have had the pleasure of examining some parts of the area, 

 for generously placing his thorough knowledge of the district at my 

 service ; to Dr. Wheelton Hind for some assistance in the field, and 

 for kindly identifying the lamellibranchs and cephalopods collected 

 by me in the Pendleside Beds ; and to Mr. C. B. Wedd, not only for 

 valuable information and for some assistance in the field, but also 

 for helpful criticism during the later stages of my work. 



My thanks are due to the Director of H.M. Geological Survey, 

 for kindly permitting me to examine the collections of fossils 

 recently obtained from the Midland area by the Officers of the 

 Survey. 



The excellent photographs (reproduced in PI. I) illustrating the 

 palaeontological part of this paper are the work of Mr. J. W. Tutcher, 

 to whom I offer my sincere thanks. 



IX. Description of certain Corals and Brachiopods 

 FROM the Midland Area. 



(A) CORALS. 



Michelinia. 



Michelinia glomerata, M'Coy. 



Described & figured in ' Brit. Palaeoz. Foss. ' 1855, p. 80 & pi. iii b, fig. 14. 



The specimens which I include here are characterized as 

 follows: — The corallites are never specially elongated. The tabulae 

 are convex upwards ; a few of them are continuous across a 

 corallite, but the great majority, which are not so continuous, 

 form large vesicles. 



This form occurs somewhat uncommonly in the upper part of D^ 

 and in D3. 



The tabular structure of Michelinia glomerata is much less finely 

 vesicular than in the Lower Avonian species of Michelinia, namely, 

 M. cf. favosa and M. cf. megastoma. In the simplification of its 

 tabulae, Michelinia glomerata approaches Beaumontia, which cha- 

 racterizes the uppermost part of the Avonian, that is, D . 



