250 BRITISH CARBONIFEROUS BRACHIOPODA. 



Uphill ; Cheddar. For the knowledge of many of these localities, as well as for 

 some in Gloucestershire, I am indebted to the Geological Survey, to Messrs, 

 Salter, Etheridge, Moore, Walton, and W. Stoddart, &c. 



WALES. 



In Wales, nine counties have hitherto afforded about forty species ; Denbighshire, 

 Flintshire, and Glamorganshire, having produced the largest number. 



The following are the principal localities with which I am at present acquainted, 

 and are to some extent taken from the unpublished lists of the Geological Survey of that 

 portion of Great Britain : 



Pembrokeshire. — Skrinkle (lower black Carboniferous shales), Tenby j Caldy, Giltar 

 Point. Pembroke dockyard. 



Anglesea. — Llynback, six miles east of Llanerchymedd, Pencaint, Llangefri. 



Carnarvonshire. — Great Ormes Head. 



Denbighshire. — Langollen Crags ; Tyfyn-uchaf, near Ruabon ; Chirk. 



Flintshire. — Mold ; Bryn-davin-mold ; Halken Mountain ; Holywell. 



Brecknockshire. — Not far from Rymney Gate. 



Glamorganshire. — Cowbridge ; Castle Mumbles ; Newton. 



Carmarthenshire. — Cromanraon, north of Curnammon. 



Montgomeryshire. — Lanfyllin. This locality is close to the boundary line of Shropshire, 

 and near Oswestry. 



SCOTLAND. 



In Scotland fourteen counties have afforded fifty species ; l and it has been calculated 

 by Prof. Nicol that the Carboniferous strata cover nearly a seventeenth of the entire 

 surface of the country ; but it is very difficult to form a correct estimate, on account of the 

 numerous breaks from intrusive igneous rocks, rendering mapping very complex. It is, 

 however, in the central portion of Scotland that the rocks which we are now describing 



1 All the species and their localities have been described in my monograph of the Carboniferous Bra- 

 ehiopoda of Scotland, published in the ' Geologist' for 1860. 



