162 O^ological Society, 



of which can be traced round its outcrop, whilo the Yisean lime- 

 stones occupy the core. Much of the country is obscured by drift, 

 chiefly derived from the underlyinp; rocks. 



A study of the limestone-l'auna shows that the Geological Survey 

 boundary between the Upper and Lower Limestones corresponds 

 with the transition from a Tournaisian to a Yisean fauna; the 

 Lower Limestone cannot, however, be separated from the underlying 

 shales ; and the Middle or ' Calp ' Limestone contains a fauna 

 distinct from that of the Upper or Barren Limestone, although they 

 are not separable on lithologioal grounds. An account is given of 

 the zones recognized in County Clare, and a correlation made with 

 the sequence in other British localities. 



The Old Bed Sandstone is succeeded, to all appearance conform- 

 ably, by a thin series of sandy shales containing brachiopods 

 characteristic of the Cleistojiora-Zone, at the base of which a band 

 is found containing abundant Modioliform lamellibranchs. The 

 ZaphrentiS'Zone is well developed, the c?a/Ami«s-snbzone forming 

 the top of the Lower Limestone-Shales, and the ^■on^nc^•^-subzone 

 the lower stratified limestone. 



The most remarkable portion of the whole sequence is included 

 in the Si/nnf/otJiuris-Zono, which is represented by massive grey 

 and white mottled limestones with a luxuriant moUuscan fauna, 

 large cephalopods being especially abundant. These beds show 

 evidence of deposition in shallow water, affording further proof of 

 a mid-Avonian period of upheaval. The fauna is compared with 

 that of the Waulsortian phase of Belgium. The incoming of a 

 Yisean fauna is well marked at the base of the Seminida-Zone ; in 

 the middle of this zone occurs an important bed of oolitic limestone, 

 wath abundant gasteropods. The Dibit nopJu/Uum-Zone attains a 

 thickness equal to that seen in the Midland area. D^ is chiefly 

 characterized by the abundance of simple Dihunophylla, Cyatho- 

 pTiyllum murchisoni, Clisiophyllid Lithostrotions, aud Productus 

 latissimo-giganteus ; D^ by the occurrence of Lonsdalia aud Cyaiho- 

 phyllura rer/ium ; and Dg by the abundance of Zaphrentids, Canrnia, 

 and Densiphyllids, and the apparent absence of Clisiophyllids and 

 Lithostrotions. 



An account of the chief fossil localities, under the headings of the 

 separate Baronies, is then given, and the paper concludes with 

 palaeontological notes. 



2, ' A New Species of Sthenurus.' By Ludwig Glauert, F.G.S. 



In a large collection of remains of extinct Marsupial mammals 

 from the Mammoth Cave, Margaret River (Western Australia), 

 the Author recognized several mandibles of a new kangaroo of the 

 genus Sthenurus. He now communicates a detailed description of 

 one specimen, and shows that the new species most nearly resembles 

 Stheyiurus areas (De Yis) and Sth. atlas (Owen), 



