BY W. F. PETTERD. 81 



Amnicola diemense V. Frfld. Trans. K. K. Zoo. and Bot. 

 See. Vol. XIV. Page, 599. No. 268, 1864, in the i-relimi- 

 nary examination of the genera and species of Hydrobia^ 

 Amnicola, &c. See Trans. K. K. Zoo. and Bot. Society, 1863. 

 Page 1,028." 



Note. — The plates are missing in the volume of the Vienna 

 Societies Transactions, contained in the library of the Austra- 

 lian Museum, Sydney, N. S. AVales. The Lii)uean Society of 

 N. S. Wales do not possess a copy for the year 1865. 



This species will probably prove to be the Beddomeia 

 Latincesionensis, JoJmston, in which case Von Frauenfold's 

 name will have to be retained. 



Unio Legrandi. ;/. sp. 



JJnio Moretonicus. Reeve, Woods, Pro. Hoi/. Soc. Tas., 1876. 

 Tate and Braziei'. " Check list of the Fresh-icater Shells of 

 Australia:' Pro. Linn. Soc, N.S.W., 1881. 



Of the widely distributed and extremely variable genus 

 ZTnio, we have but a single representative, the one that is 

 peculiar and so abundant in our northern streams. To this 

 shell tradition has ai^plied the specific term Moretonicus, under 

 which name it is given by the Rev. Tenison -Woods in his 

 list of the fresh-water shells of this island (Pro. Roy. Soc. 

 Tas., 1876). How this identification originated or by whom 

 applied I have quite failed to discover, but that it is an error is 

 fully elucidated by Mr. E. A. Smith in his paper on the fresh- 

 water shells of Australia (Pro. Linn. Soc. of Loudon, 1882); 

 there the learned author gives an exhaustive summary of the 

 numerous species occurring on the mainland with their full 

 bibliographical history, and the results of a careful study of the 

 extensive series of examples contained in the collection of the 

 British Museum is fully explained. Under Unio deprcssxis. 

 Lam., a species common to the Nepean, Bogan, Brisbane, and 

 Murray rivers, it is stated that " The U. depressus of the 

 * CoDchologia Iconica,' fig. 81, is a very distinct species, and 

 approaches certain varieties of U. amhiguus, the specimen 

 figured being from Tasmania ; " an examination of the figure 

 proves this statement to be correct, although the shell 

 represented is not nearly so elongated as the great majority 

 of the examples that I have collected. The IT. Moretonicus, 

 Reeve (Con. Icon., fig. 118), is given as a variety of 

 Z7. Ausiralis Philippi, but without any precise locality. The 

 plate illustrates a shell of quite a different outline to any of 

 the many hundreds of Tasmanian specimens that I have 

 carefully examined. 



The U. amhiguus, Parrci/ss, is from the Balonne, Bogan, and 

 the Onkaparinga rivors, and although in many respects it 

 approaches the species of our streams it is clearly specifically 



