PETTERD : ON FRESHWATER SHELLS OF TASMANIA. 85 



24. Valvata tasmanica, Tennison Woods. Pro. Royal Soc, 



1875? 



Habitat — Creek in Gould's Country, North-East Tas- 

 mania. Resembles in a most striking manner very j^oung 

 specimens of Amnicola Launcestonensis^ Johnston. 



25. Bithynia Simsoniana, Brazier, as Amnkola Siinsoniana. 

 Pro. Linnean Society of N. S. Wales, March, 1875. 



Bithmia pontvillensis, Tennison Woods. Pro. Royal 

 Soc. Tas., August, 1875. 



Habitat — Jordan River. The whole of the species are 

 but provisionally classed as Bithynia, for it may possibly be 

 found requisite to erect a subgenus for their reception. 



26. Bithynia duiyertonensis, Tennison Woods. Pro. Royal 

 Soc. Tas., August, 1875. 



Habitat — Lake Dulverton, Esk River, First Basin, Laun- 

 ceston. The epidermis of silvery scales are probably an 

 encrustation of DiatoviacecE. 



27. Bithynia Petterdiana, Brazier, as Amnicola Petterdiana. 

 Pro. Linnean Soc. N.S.Wales, March, 1875. 



Habitat — Ringarwina and other parts of North Coast. 

 This may be but a variety of the preceding. 



28. Bithynia Wisemaniana, Brazier, as Paludesttina Wise- 

 7naniana. Pro. Zool. Soc. London, 187 1, 



Bithynia tasmanica, Tennison Woods. Pro. Royal Soc. 

 Tas., August, 1875. 



Habitat — Generally distributed in almost all running 

 creeks. 

 Small variety: — 



Bithynia Legrandi, Tennison Woods. Pro. Royal Soc< 

 Tas<, August, 1875. . 



Habitat — Brown River, Launceston. 

 Carinated variety : — 



Bithynia Legrandiana, Brazier^ 2,% Paludestrina Legraii' 

 diana. Pro. Zool. Soc, London, 187 1. 



