318 On the Fossil Floras of the Wyre Forest. 



thickness. The Middle Coal Measure flora of the Wyre Forest includes 

 55 species, of which three are new, two of them being new species of 

 Sigillaria, and one, a new type of seed-impression. Four other plants are 

 new records for Britain. The Transition Coal Measure flora is smaller, but 

 includes 20 species, of which one is a new British record. 



It is shown that both the Middle and Transition Coal Measures of the 

 "Wyre Forest Coalfield consist of red-grey measures with Espley rocks. In 

 the Transition Coal Measures Spiro rfo's-lhnestones also occur. The distribution 

 of these rocks is considered in detail. 



The Wyre Forest is discussed in relation to the other coalfields of the 

 Welsh Borderland. The lower or productive measures of Coalbrookdale, and 

 also the coals of the Titterstone Clee Hill are shown, on the plant evidence, 

 to be Middle Coal Measures. A species of Cordaicladus new to Britain is 

 described from the latter coalfield. It is pointed out that the Coalbrookdale- 

 Wyre Forest field really consists of four distinct coalfields, in part super- 

 imposed on one another. Two of these, the Lower Series of Coalbrookdale 

 and the Sweet Coal Series in the Wyre Forest, are of Middle Coal Measure 

 age. These are quite separate areas, and are in part overlain unconformably 

 by two other coalfields of Transition Coal Measures, one connecting Coal- 

 brookdale and the Wyre Forest, and the other confined to the southern part 

 of the Wyre Forest, overlying Old Bed Sandstone. 



It is contended that the coalfields of Shrewsbury, Le Botwood, Coalbrook- 

 dale, Wyre Forest, Titterstone Clee Hill and probably Newent form a related 

 series, which, with the exception of the Lower Series of Coalbrookdale, is 

 quite distinct lithologically from the Midland and Southern Pennine coal- 

 fields. If this is the case, it is pointed out that the theories of the originally 

 continuous sheet of measures, and of subsequent excessive denudation of the 

 Welsh Borderland, are inaccurate hypotheses, which should be abandoned. 



Intermittent Vision. 

 By A. Mallock, F.B.S. 



(Received November 11, — Read December 11, 1913.) 

 [This paper is published in ' Proceedings,' Series A, vol. 89, No. 612.] . 



