222 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Cyrenopsis (?) corrugata, Tate, sp. 

 Teredina opalina, Giirich. 

 Fissilunula clarkei, Moore, sp. 



Gastropoda. 



Pseudamaura variabilis \ , j- 

 Pseiidamaura reflecta j ' ^" 



Viviparus (?) alba-scopularis, Etheridge, jun. 



Cephalopoda. 



Belemnites canhatni, Tate. 

 Belemnites kleini, Giirich. 



In some prefatory remarks to Mr. Etheridge's memoir, !Mr. E. F. 

 Pittman introduced a detailed section of the deposits at White Cliffs, 

 and supported their Upper Cretaceous age, which was first 

 pronounced by Anderson, as against Giirich's view that they should 

 be considered younger Jurassic. A comparatively new opal-field at 

 Lightning llidge, New South AVales, was reported upon in 1906 by 

 Mr. J. B. Jaquet.' From a geological section (text-figure) accom- 

 panying the account, it is seen that the Upper Cretaceous or Desert 

 Sandstone beds of this area consist of '* white powderj' siliceous rock, 

 with opal ", beneath being the Lower Cretaceous or Rolling Downs 

 deposits, and surmounting tlie whole is a capping of " quartz pebble 

 conglomerate". There is no reference to the occurrence of 

 fossiliferous remains, although Mr. Jaquet regarded the beds as 

 identical in their modes of structure with those at White Cliffs. The 

 locality is famous for the much-coveted ' black opal ' which is found 

 in association with opals of ordinary character. 



A new interest was given to the Lightning Ridge Beds- in 1910, 

 when it was announced by Dr. A. S. Woodward that Dinosaurian 

 bones had been discovered there, representing a small Megalosaurian 

 animal now preserved in the Geological Department of the British 

 Museum (R. 3716-18). The account stated that the specimens 

 were opalized, and that they occurred with other bones and shells 

 in a similar condition, their geological age being given as Upper 

 Cretaceous. 



A reference to the opalized deposits of New South Wales was made 

 by Mr. C. A. Siissmilch^ in connexion with both White Cliffs and 

 Lightning Ridge. At the former locality he mentioned the occurrence 

 of shells, reptilian bones, and fragments of fossil wood, wholly or partly 

 replaced by precious opal ; he regarded the beds as of Upper Cretaceous 

 age, the opalization being I'eferred to as of secondary origin. 



'"The Wallangulla Opal Field": Ami. Rep. Dept. Mines N.S.W. for 



1905, 1906, pp. 68-9. 

 - "On Remains of a Megalosaurian Dinosaur from New South Wales " : 79th 



Rep. Brit. Assoc, for 1909, 1910, pp. 482-3. 

 ' An Introduction to the Geology of Neiv South Wales [Sydney'\, 1911, p. 125 



(with coloured geological map). 



