96 president's address — section d, 



and marginata.J It is these shells which, together with those 

 of Elenchus irisodontes are used in making the well-known 

 necklaces. 



With regard to slugs, comparatively little is known at 

 present. It is, however, worth noticing that a peculiar genus, 

 Cystopelta, with one species ( C. petterdi) described by 

 Tate, has since been taken in Victoria at Ballarat and just 

 across the border at Mt. Kosciusko. 



(2.) Fresh Water Mollusca. — In these there are the repre- 

 sentatives of" 9 families in Australia and Tasmania, viz. : — 

 Lymnaeidae, Melaniadse, Paludinida:', Valvatidse, Neritidse, 

 Rissoidae, Assiminidae, Cycladidae, and Unionidae. Of these 

 three, the Melaniadae, Paludinidae, and Neritidae, are absent 

 from Tasmania, Of the three families absent from Tasmania, 

 the Paludinidae and the INeritidae are also wanting in Victoria, 

 whilst of the third, the Melanidae, which is only at all well 

 represented in Queensland (10 species), Victoria has only a 

 single species. 



The 7 families named contain altogether in Australia and 

 Tasmania 25 genera with 213 species. Both in number of 

 genera and in species Tasmania is ahead of any other division 

 of the region, containing 17 genera with 55 species the next 

 being Queensland with 12 genera and 45 species, then New 

 South Wales with 13 genera and 37 species, and then, very 

 closely equal, Victoria with 11 genera and 25 species and 

 South Australia with 1 1 genera and 26 species. 



The genus Lymnea has 4 species of which one ( L. laun- 

 cestanensis var. papyraceaj is found in Victoria and South 

 Austraha; two are peculiar and one is common to South 

 Australia only. 



Bulinus is well represented by ]9 s])ecies, of which, as at 

 present recorded, all save one (13. jxyramidata) are peculiar, 

 that one being common to Victoria. Austi-alia and Tasmania 

 have between them 68 species of this genus which is well 

 I'epresented in all the Colonies and there are comparatively 

 few not peculiar to a single Colony. 



Ancylus has 3 peculiar species in Tasmania and only 2 

 on the Continent, of which one (A. austraiicusj is common 

 to Victoria, South Australia and Queensland and another 

 (A. smithij is peculiar to New South Wales. 



The most interesting freshwater mollusc of Tasmania is 

 however Gundlachia pettei'di describe i by Johnston from 

 near Launceston and again by Professor 'late from Mount 

 Lofty, South Australia. This is, so far as yet known, the only 



