84 PETTERD : ON FRESHWATER SHELLS OF TASMANIA. 



19. Gundlachia Petterdi Johnston. Pro. Royal Soc.Tas., 1878. 



Habitat — Still water near Launceston. The first of the 



genus hitherto recorded from Australasia. Generally found 



attached to acquatic plants, and almost invariably thickly 



covered with Diatomacea. 



21. Pomiatopsis striatula, Meuke. Moll. Nov. Holl., p. 9; 

 Cox, Men. Australian Land Sh., 1862, p. 95, pi. xv., fig. 13a, 

 b and c. 



Habitat — Muddy and Clarence Plains, Flinders Island; 

 also Victoria and South Australia. Mentioned by Cox, in 

 Mon. as a land shell. Mr. Johnston has described a subfossil 

 species, jP. Badgerensis from the consolidated sand dunes of 

 Badger Island, Bass Strait, having a very close resemblance 

 to the existing species. In the same formation Helix 

 Weilmgtojtefisis, Helix pictilis, and a species of Bittium and 

 Lyinncea occur. 



22. Assiminea tasmanica, Tennison Woods, Pro. Royal 

 Soc. Tas., 1875. 



Habitat — Sorell and Brown River, within the tidal in- 

 fluence of the salt water. This has been redescribed by the 

 Rev. T. Woods, by mistake, as a marine species under the 

 name of Rissoa (Sella) sie72?ice. 



23. Ampullaria tasmanica, Tennison Woods. Pro, Royal 

 Soc. Tas., 1 8 76. 



Habitat — River, north coast. The examination of the 

 animal will probably necessitate the forming of avnew genus 

 for this little species, although the Rev. Mr, Woods seems 

 confident that he assigns it to the right genus by placing it 

 in Ampullaria. I have never met with the shell, although 

 I have carefully searched the greater number of the northern 

 streams; it may, however, be local and restricted to one 

 locality which is unknown, for its discoverer, Mr. Gunn, is 

 unable to give the precise habitat, 



J.C, ii., Mar., 1879 



