Vol. 65.] 



CARBONIFEROUS LIMESTONE OF COUNTY CLARE. 



551 



C = Zone of Syrinyothyris cuspidata mut. C 

 (Sykingothyris Zone). 



Former designation. — Lower TTnstratified or Fenestella Lime- 

 stone. 



Lithological characters. — Massive limestones, with a charac- 

 teristic dark-grey and white mottled coloration, often assuming 

 the aspect of marble. 



The rock is, in many exposures, crowded with the remains of 

 bryozoa, the cross-sections of which give it a peculiar spotted 

 appearance. The interiors of molluscan and brachiopod shells 

 are usually filled with pure white crystalline calcite. Bedding is 

 rarely visible, except in a pale-grey crinoidal band near the base. 



The limestone is often magnesian, and becomes a true dolomite 

 of a yellowish colour at the summit. 



Chert is never found in this zone. 



Faunal list : — 

 Brachiopods : 



Syringothyris cuspidata (Mart.). 

 Spirifer (Brachythyris) pinguis, 



Sow. 

 Spirifer (Brachythyris) ovalis, 



Phill., and var. hemispheric a, 



M'Coy. 

 Spirifer aff. clathratus, M'Coy, 



Vaughan. 

 Spirifer attemcatus, J. de C. Sow. 

 Spirifer subcinctus, de Kon. 

 Spirifer konincki, sp. nov. 

 Pugnax reniformis (Sow.). 

 Pugnax piignus (Mart.). 

 Schizophoria resupinata (Mart.) 



Corals ; 

 Amplexus coralloides, Sow. 



Mollusca : 



Vestinautilus carinifer (J. de C. 



Sow.). 

 Trigonoceras paradoxicum 



(J. de C. Sow.) 

 Solenocheilus dorsalis (Phill.). 

 Apheleceras mutabile (M'Coy). 

 Glyphioceras sphcericum (Martin). 

 Orthoceras leinsterense, Foord. 

 Asymptoceras sp., Eyckholt. 

 Poterioceras fusiforme (J. de C. 



Sow.). 



Crinoids : 



Actinocrinus tessellatus (Phill.). 



Bielasma hastatum (J. de C. Sow.). 

 Bielasma kingi, de Kon. 

 Productus aff. semireticulatus 



(Mart.). 

 Productus ef. concinnus (Sow.). 

 Productus aff. quincuncialis, Phill., 



mut. C. 

 Productus com, D'Orb., mut. C. 

 Productus plicatilis, Sow. 

 Athyris aff. glahristria (Phill.). 

 Athyris hibernica, nom. nov. 

 Leptcsna cf. ancdoga (Phill.). 

 Athyris planosulcata (Phill.). 

 Spiriferina cf. insculpta (Phill.). 



Euomphalus pentangulatus, J. Sow. 

 Euomphalus ef. latus, Hall. 

 Loxonema lefebvrei (L'Eveille). 

 Naticopsis plicistria (Phill.). 

 Faticopsis aff. phillipsi, M'Coy. 

 Cardiomorpha egertoni (M'Coy). 

 Cardiomorpha oblonga ( J.de C. Sow.). 

 Edmondia lyelli. Hind. 

 Conocardium hibemicum, Sow. 

 Sanguinolites omalianus (de Kon.). 

 Aviculopecten plicatus, Sow. 



