CONTENTS. 



13iiowNE, W. R. : The Igneous Rocks of Encounter Bay^/South Aus- 

 tralia. (Oommunicated by Prof. W. Howchin.) PFates i. to iv. 1 



Lower, Oswald B. : Nevr Australian Lepidoptera. 58 



Wilton, Dr. J. R. : Certain Diophantine Problems ... 71 



Black, J. M. : Vocabularies of Four South Australian Languages- 

 Adelaide, Narrunga, Kukata, and Narrinyeri — with Special 

 Reference to their Speech Sounds ... 76 



FiNLAYsoN, H. H. : Essential Oil from the Fruits of Callitris 



verrucosa. (Communicated by Prof. Rennie) ... ... ... 94 



Robertson, Prof. T. Brailsford : Studies in Comparative Physi- 

 ology. 1, Observations on the Physiology of the Fly's Int-^stine 97 

 Rogers, Dr. R. S., and C. T. White : A Contribution to the Orchid- 

 aceous Flora of Papua (British New Guinea). Plates v. to viii. 110 



Turner, Dr. A. Jefferis : A Revision of the Australian Noctuidae 120 



Black, J. M. ; Additions to the Flora of South Aus'^ralia, No. 17. 



Plates ix. and x. 190 



Carter, H. J. : Revisional Notes on the Family Cistelidae (Order 



Coleoptera) 198 



Lea, Arthur M. : On Ditropidus and Allied Genera (Coleoptera, 



Chrysomelidae) ... ... ... ... ... ... ... ... 218 



Riddle, Arthur R. : An Adventitious Occurrence of Nautilus 

 pompilius, Linn., with a Short Bibliography on Ocean Currents 

 aflPecting tlsp Australian Coast ... ... ... ... 257 



AsHBY, Edwin: Chitons of the D'Entrecasteaux Channel, Southern 

 Tasmania, including Additions tp the Tasmanian Fauna, and 

 Descriptions of a New Species and a New Variety. Plate xi. 263 



AsHBY. Edwin : A Review of Chiton crispus, Reeve (Order Poly- - 

 placophora), and its Allies, with Proposed Recognition of 

 BlsimviWe's Chiton lineolatus, and Description of Three New 

 Species. Plates xi. and xii, ... ... ... ... ... ... 272 



AsHBY, Edwin : Further Notes on Australian Polyplacophora, with 



Additions and Corrections of the 1918 Distribution List ... 283 



Riddle, Arthur R. : An Observation on the Toning of Photo- 

 graphic Silver Images ... ... ... ... ... ... ... 293 



Howchin, Prof. Walter: Autoclastic, Intraformational, Entero- 

 lithic, and Desiccation Breccias and Conglomerates, with 

 References to some South Australian Occurrences. Plates xvi. 

 to xxi. ... 300 



Rogers, Dr. R. S. : Contributions to Australian Orchidology. 



Plate xiii. .- ... 322 



Jones, Prof. F. Wood : The External Characters of Pouch Embryos 

 of Marsupials. No. 1 — Trichosurus vulpecula, var. typicus. 

 Plates xiv. and xv. ... ... ... ... ... ... ... 360 



Black, J. M. : Additions to the Flora of South Australia, No. 18. 



Plates xxii. and xxiii 374 



Miscellanea — 



Notes on Occurrences during Summer Recess. 1919-20 379 



Obituary Notice of Robert Etheridge ... ' 379 



The Solvent Effects of Sea Water on Limestones 381 



Note on the Generic Position of Certain Australian Cambrian 



Trilobites 382 



Sarsen Stones and Drift Pumice in New Zealand 383 



Notes on X-ray Phenomena 383 



Radio-active Photograph of Autunite 385 



Radiograph of a Skull of an Australian Aborigine 385 



Coorongite 386 



Abstract of Proceedings 387 



Annual Report 394 



Balance-sheets ... 396 



Donations TO the Library 398 



List of Members 408 



Appendix — Field Naturalists' Section: Annual Report, etc. ... 411 



General Index ... 417 



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