Records of the Australian Museum (1988) Vol. 40: 233-264. ISSN 00671975 233

Early from Gundy, Upper Hunter, New South Wales

E.K.Yoo New South Wales Department of Mineral Resources G.P.O. Box 5288, Sydney, NSW 2000, Australia

ABSTRACT. Minute mollusc fauna of Late Tournaisian age from thin limestone bands of the upper part of the Dangarfield Formation near Gundy, Upper Hunter, New South Wales are classified and described. Eighteen species among 38 gastropod species referable to 31 genera are described as new - Onychochilus minitissimus, Peruvispira gundyensis, Glabrocingulum obesum, Hesperiella robertsi, Borestus costatus, Araeonema microspirulata, Microdoma angulata, Eucochlis australis, (Naticopsis) osbornei, Aclisina turgida, Stegocoelia (Stegocoelia) nodosa, Stegocoelia (H~pergonia) elongata, Stegocoelia (H.) tenuis, Loxonema elegantissima, Hemizyga (Hemizyga) (/(?cussata, Cyclozyga sinusigera, Soleniscus callosus and Donaldinajilosa. Twenty European andNorth American generic names are introduced for the first time to the Australian gastropod fauna. Two new scaphopod genera, Scissuradentalium and Pipadentalium, and four new species, Fissuradentalium longistriatum, Scissuradentalium runnegari, Plagioglypta numerosa and Pipadentalium protruberans, are proposed. One species ofhYQlitha, Hyolithes minutissimus, is described. Nine bivalve forms including two unknown taxa are illustrated, but not described here. All mollusc specimens are chloritised. Yoo, E.K., 1988. Early Carboniferous Mollusca from Gundy, Upper Hunter, New South Wales. Records of the Australian Museum 40(4): 233-264.

Contents Introduction ...... 234 Materials and Methods ...... 234 Type Locality ...... 234 Stratigraphy ...... 234 Dangarfield Formation ...... 234 May Farm Mudstone Member ...... 234 Upper Part of Dangarfield Formation ...... 234 Geological Age of Fossil Assemblage ...... 235 Evidence from Other Local Fauna ...... 235 Evidence from Gastropod Fauna ...... 236 Preservation ...... 237 Systematics ...... 237 ...... 237 Scaphopoda ...... 248 Hyolitha ...... 250 Discussion ...... 250 Acknowlegements ...... 251 References ...... 251