6oO FAUNAL SUCCESSION OF THE UPPER BERNICIAN 



Caninia cf. cormtcopicB, Nich. 



Zaphrentis near oystermouthensis, Vaughan. 



Zaphrentis constricta, Carruthers. 



All the species above cited, with the exception of the last, 

 are common in the D2-3 Beds of Gower, South-West 

 Province. Associated with the above are a few repre- 

 sentatives of standard conditions D2 and Dy : Clisiophylhun 

 nr. subimbricatum, Thom. ; Koninckophyllum magnificum, 

 Thoni. and Nich.; Diphyphyllnm lafeseptatum, M'Coy, and 

 small variant. 



IVa.— (Dy). 



The main fauna represents standard conditions, and is 

 extremely rich. 



Dibunopliylhnn muirlieadi, Thom. and Nich., and var. D. 

 splendens. Dibuuophylhim <^ Vaughan and variants. 



Koninckophyllum magnificum, Thom. and Nich., and nu- 

 merous variants, including Dibunophylloid and Diphyphylloid 

 varieties, e.g., Diphyphylhim dianthoides (M'Coy) and Konincko- 

 phyllum neaT interruplum, Thom. and Nich. 



Diphyphyllum subibicimim, D. lateseptattim, and D. concinnum. 



Lonsdaleia duplicata, Phill., and massive variant L. conaxis, 

 M'Coy. 



Also Cyclophyllum a.^. pachyendofhecum, Thom., which does 

 not as yet possess any great value except as an index of D. 

 (Some forms referred to Aulophylhim by Thomson are merely 

 the young stages of the species cited above). 



The fauna appears to represent a somewhat higher coral 

 development than is found in the D2 subzone of Lonsdaleia 

 floriforinis of the South-West Province, and consequently the 

 beds are probably higher than the uppermost limestone of 

 that area. Whenever both Lonsdaleia flo7'iformis and Lonsdaleia 

 duplicata are found, their maxima occur in the order above 

 stated. In the S.W. Province the only massive Lonsdaleia is 



