Vol. 67.] THE CAKBONIFEROUS SUCCESSION IN GOWER. 543 



Brachiopods : — 



The following gentes and groups : — 



Productus corrugato-hemisphtricus. Productus pustulosis. 



Productus punctatus. Productus sublcevis. 



Productus elegans. Spirifer aff. bisulcatus. 



The genera Actinoconchus, Seminula, Dielasma. 



Furthermore, the C 2 and S x faunas are linked by 



Cyathophyllum <p, 

 Cyathophylloid Caninice. 

 Early Carcinophylla. 

 Megastomatoid Michel inicB. 

 Productus corrugatus, uiut. C. (nearly 

 equivalent to Productus 9 of S 1 ). 



Chonetes cf . comoides (of great size). 

 Certain large species of Bellerophon 

 and Euomphalus. 



(In fact, beyond the occurrence of Lithostrotion there is frequently 

 no other distinction between C 2 and S r ) 



Dr. Gosselet in 'L'Ardenne' 1888, chap, xxii, includes the C 2 

 fauna (the Productus-sublcevis Beds) with the typical S fauna above 

 in a single ' assise,' the ' Calcaire des Ardennes.' The transition 

 from the Productus- sublcevis fauna into the basal Pr.-corrugatus 

 fauna is, in fact, exactly that which marks the passage of C 2 into 

 81 in the South-Western Province generally. 



Hence it will be entirely in accordance with the faunal evidence 

 to draw the line of division between the Upper and the Lower Avonian 

 at the bottom of the main part of C 2 . The divide will therefore 

 lie within C 2 , as at present defined, above the lowest part of the 

 standard limestones, which contains a recurrent C x fauna. 



VII. Faunal Lists [A. V.]. 



Note. — Here and in the Palaeontological Section, repetition of 

 full references is avoided by the following abbreviations : — 



' Bristol Paper' = Q. J. G. S. vol. lxi (1905) pp. 181-305 & pls 4 xxii-xxix— 



4 Palaeontological Sequence in the Carboniferous Limestone of the Bristol 



Area,' by A. Vaughan. 

 ' Rush Paper ' = Q. J. G. S. vol. lxii (1906) pp. 275-322 & pis. xxix-xxx— 



' Carboniferous Rocks at Rush (County Dublin),' by C. A. Matley & 



A. Vaughan. 

 ' Loughshinny Paper' = Q. J. G. S. vol. lxiv (1908) pp. 413-72 & pis. xlix-1 



— ' Carboniferous Rocks at Loughshinny (County Dublin),' by C. A. 



Matley & A. Vaughan. 

 ' Davidson ' = ' Monogr. Brit. Foss. Brach.' vol. ii (1858—63;, Palceont. Soc. 



Except in the case of D 23 , as explained below, no attempt was 

 made to draw up an exhaustive list at any level ; immediately the 

 zonal position had been placed beyond doubt, further search was 

 abandoned. 



