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ON SOME MOLLUSCAN REMAINS FROM THE OPAL DEPOSITS 

 (UPPER CRETACEOUS) OF NEW SOUTH WALES. 



By 11. liuLLEN Newton, F.G.S. 



Bead 8th January, 1915. 



(Published by permission of the Trustees of the British Museum.) 



PLATE VI. 



During a recent visit to Australia, as a member of the Britisli 

 Association, I was fortunate in obtaining from a curio-merchant at 

 Sydney a few of the rare opalized fossils of Upper Cretaceous age 

 fouud in the opal-bearing strata of White Cliffs, iSTew South Wales, 

 some 65 miles N.N.W. of the townsliip of Wilcannia, comprising the 

 remains of both marine and freshwater shells, as well as a small 

 phalangal bone of a Plesiosauiian {Cimohosaurus). These fossils 



Scale : 265 miles to the inch. 



now enrich the palseontological collection of the Rev. F. St. John 

 Thackeray, M.A., F.G.S., tlie Vicar of Mapledurham, near Beading, 

 to whom I am indebted for the privilege of describing them on this 

 occasion. But, as well as considering Mr. Thackeray's specimens, the 

 opportunity will be taken of referring to similarly opalized sliells 

 from the same beds contained in the Geological and Mineral 

 Departments of the British Museum, which have been on exhibition 

 for some years, bearing more or less provisional identifications, a new 

 study of which, it is hoped, will lead to a more accurate knowledge 

 of their relationships. 



The British Museum (Geological Department) also possesses two 

 Pelecypods of freshwater habits from the Lightning Ridge opal-field, 

 situated in the parish of Wallangulla, county Finch, near the 

 Queensland border, and distant about 50 miles from Walgett in 



