246 



New Species, Part XV.,' ; "Notes on the Marine Mollusca 

 of Western Australia, with Descriptions of New Species, 

 Part II.," and, "Mollusca from the Great Australian Bight," 

 by J. C. Verco, M.D., F.R.C.S. "Notes on the Occurrences 

 of Silica near Mount Painter, Flinders Range," by A. C. 

 Broughton. "Description of Wild Hybrids of Australian 

 Ducks," by F. R. Zietz. "New Australian Diptera from 

 Ants' Nests/' by Frederick Knab and J. R. Mallock, com- 

 municated by A. M. Lea. "Additions to the Flora of South 

 Australia," by J. M. Black. 



ANNUAL REPORT, 1911-12. 



The Council has the pleasure to report that the contri- 

 butions to the Society's proceedings during the year were of 

 great scientific value and of considerable local interest, while 

 the exhibits at its meetings have been of a varied and inter- 

 esting character. 



The annual volume of Transactions will include, amongst 

 other papers, one by Professor E. C. Stirling, C.M.G., 

 F.R.S., on "The Giant Veranus of Central Australia," which 

 contains much unpublished information. Dr. W. G. Torr, 

 in his paper on "The Polyplacophora of South Australia," 

 has brought our knowledge of this interesting family 

 of Mollusca up to date and described several new 

 forms. Professor Kerr Grant, in his paper on "The 

 Ionization Produced by the Impact of Solid Bodies in Air," 

 has again introduced physical subjects into our Transactions, 

 and the Council hopes in future to receive many of his valu- 

 able contributions. 



Several series of papers which have been running 

 through the Transactions for some years have been continued 

 during the present session. Dr. J. C. Verco deals again with 

 the South Australian Marine Mollusca and with the Marine 

 Shells of Western Australia; Mr. A. M. Lea, F.E.S., with 

 Australian Curculionidae ; Mr. J. M. Black with South 

 Australian Introduced and Indigenous Plants; and Mr. W. 

 Howchin, F.G.S., with the Geology of South Australia. 



The Society has suffered a great loss by the death of 

 the Rev. Canon Blackburn, B.A., F.E.S., who, since his 

 election as a Fellow in 1887, has been the most voluminous 

 contributor to the Society's Transactions. Part xlii. of his 

 "Notes on Australian Coleoptera," which was almost ready for 



