C O N r E N T S . 



•^^►^ Page. 



Bkowne, W. R. : The Igneous Rocks of Encounter Bay, South Aus- 

 tralia. (Communicated by Prof. W. Howchin.) Plates i. to iv. 1 



Lower, Oswald B. : New Australian Lepicloptera 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 Intestine 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 Australia, No. 17. 



Plates ix. and X. 190 



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



Coleoptera) ^ 198 



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



Chrysoanelidae) ... ... ... ... ... ... ... ... 218 



Riddle, Arthur R. : An Adventitious Occurrence of Nautilus 

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

 affecting the Australian Coast ... ... ... ... ... 257 



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

 Tasmania, including Additions to 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 

 Blainville'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,'Ent€ro- 

 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 vulpecvXa, var. typicus. 

 Plates xiv. and xv 360 



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



Plates xxii. and xxiii. ... ... ... ... ... ... ... 374 



