﻿Vol. 64.] IN THE CAEBONIFEEOTJS KOCKS AT LOUGHSHINNY. 437 



(ii) Brachiopods: 



(x, z) Productus aff. antiquatus, Sow. 



(x, z) Froductus concinno-longispin us. 



(z) Productus sulcatus, Sow. 



(x, y) Productus aff. giganteus (Mart.).^ 



(z) and Yar. near Pr. edelburgensis, Phill. 



(x) Productus acid eatus (Mart.). 



(z) and var. near Pr. rb«??^m?ms, Dav. 



(z) Productus plicatilis, Sow. 



(z) L&ptcBna cf. distorta (Sow.), 



(x, z) Schizoplioria resupinata (Mart.). 



(x, y, z) Spirifer aff. bisulcatus, Sow. 



(y, z) Spirifer aff. striatus (Mart.)^ and varieties. Abundant. 



(z) Eeticularia lineata (Mart.). 



(x, y , z ) Eeticularia lineata (Dav.) . ^ Common. 



(z) Martinia glabra (Mart.) & (Dav.), and circular variety. 



(z) Bielasma near ficus, M'Ooy. 



Equivalence to the Curkeen Limestone. 



The abundance of striate Spirifers in identical varieties, the close 

 resemblance of the brachiopod-faunas, and the occurrence in both 

 limestones of Clisiophyllum curheenense and a Koninckophylloid 

 Lithostrotion, suggest the equivalence of the BibunopJiyllum and 

 Curkeen Limestones. The Curkeen fauna is, however, abnormal in 

 the rarity of Bibunojohylla, and in the great abundance of brachio- 

 pods ; and in these characters it approximates to a ' Knoll '-phase. 

 The facts are satisfactorily accounted for by regarding the Curkeen 

 Limestone as a contemporaneous phasal development of the Dihuno- 

 jyhyllum-Limestones. 



Correlation with the Lower Part of D^ in the 

 South-Westeru Province. 



The remarks made on p. 304 of the Rush paper, Quart. Journ. 

 Geol. Soc. vol. Ixii (1906), apply generally to the fauna of the 

 Bibunophyllum-'Liine&toTies. 



The absence of highly-developed Clisiophyllids and the general 

 similarity of the coral-assemblage to that of D, in the South- Western 

 Province strike the eye in the held. The brachiopods, however, 

 suggest a higher horizon : — Compare the occurrence of Productus lon- 

 gispinus, the abundance oi Reticularia lineata (Dav.), and the presence 

 of Martinia (jlahra. On the other hand, the form of Productus 

 giganteus lacks the latissimoid habit and old-age marks so charac- 

 teristic of D^ specimens, while Pr. longisjpinus is rare and Pr. mar- 

 garitaceus has not been found. [It is very important to recognize 

 that we are, as yet, unacquainted with anj strong development of 



^ Eesembhng the form common in D^ of the South- Western Province — 

 not Martin's form. 



^ Not Martin's form — see note on gens in Quart. Journ. Geol, Soc. vol. Ixii 

 (1906) p. 310. 



^ Nan (Mart.)— form small and globose ; dental plates usually concealed. 



