Yol. 65.] CARBONIFEROUS LIMESTONE OE COUNTY CLAEE. 



553 



The most abundant forms are Apheleceras mutabile, Conocardium 

 hibernicum, Oardiomorplia egertoni, and Euomphalus pentangu- 

 latus, but many of the others mentioned are hardly less 

 important. 



The abundance of bryozoa has been already noted ; these belong 

 chiefly to the genus Fenestella. 



Visean or Upper Carboniferous Limestone. 

 13 = Zone of Seminula ficoides and its allies (^Seminula Zone). 



-Former description. — Lower part of Upper Limestone; the 

 ' Calp ' Limestone of other districts is not recognized in County 

 Clare. 



Lithological characters. — These beds vary considerably in 

 character in different parts of the county. At the base occur 

 dark-grey limestones with an abundance of chert, above which 

 there is often an impure dolomite. 



Towards the centre of the zone, black compact crinoidal lime- 

 stones are succeeded by oolitic beds, which in some localities 

 contain pebbles of a considerable size. Pale-grey limestones of a 

 finely crystalline texture form a characteristic feature near the 

 summit. 



J^aunal list : — 

 Corals : 



Campophyllum cylindricum (Scou- 



ler) mut. Si [= Caninia]. 

 Zaphrentis omaliusi, M.-Ed. & H., 



var. densa, Carruthers. 

 Zaphrentis aff. enniskilleni, 



M.-Ed. & H. 

 Campophyllum cf. caninoides, 



Sibly. 

 Carcinophyllum aff. mendipense, 



Sibly. 



Erachiopods : 



Productus cora, d'Orb., mut. S 2 . 

 Productus aff. G of Vaughan. 

 JProductus punctatus (Mart.). 

 Productus elegans, M'Coy. 

 Productus cf. semireticulatus 



(Mart.). 

 Productus pustulosis, var. ovalis, 



Phill. 



Carcinophyllum sp. 

 Michelinia grandis, M'Coy. 

 Cyathophyllum aff. murchisoni 



(M.-Ed. &H.). 

 Lithostrotion martini, M.-Ed. & H. 

 Nematophyllum minus, M'Coy. 

 Syringopora reticulata, G-oldf. 

 Syringopora geniculata, Phil]. 

 Syringopora cf. ramulosa, Goldf. 

 Early Clisiophyllids. 



Baviesiella cf. comoides (Sow.). 

 Chonetes papilionacea, Phill. 

 Orthotetes aff. crenistria (Phill.). 

 Seminula ambigua (Sow.). 

 Dielasma aff. hastatum (Sow.). 

 Camarophoria isorhyncha, M'Coy. 



Si = Subzone of Productus cf. semireticulatus mut. S x 

 (semibeticulatus subzone). 



Special faunal characters: — 



This subzone is characterized by the incoming of a typical Vise'an 

 fauna, including the earliest Clisiophyllids and Lithostrotion. 



