OF NEW SOUTH WALKS. 135 



minor axis, from which the marginal outline is regularly curved ; 

 fossa shallow, not so deep as the line along the major axis ; septa 

 thick, granular, not exsert in four cycles of six complete systems ; 

 fourth and fifth orders very small, the rest equal ; columella thick, 

 rising in two lobes and attached to some of the septa by processes 

 which proceed from them; pedicel broadly elliptical. Dimensions, 

 alt 5, maj. axis 5, minor 2|, alt. of pedicel 2, diam. in direction 

 of maj. axis 2, minor 1. 



Princess Charlotte Bay (?) 10 fathoms. Hon. W. Macleay. 



Plate 13, fig. 7, corallum much enlarged ; fig. 7a, calice. 



On some Freshwater Shells from New Zealand. 

 By the Rev. J. E. Tenison- Woods, F.G-.S., &c. 

 Plate 13, figs. 2, 3, 4, 5, 6. 

 The following freshwater shells were submitted to me for 

 examination by Captain Hutton, P.G.S., from Lake Guyon, and 

 Taieri River, with three species of f'ythinella from the same 

 localities. From the list given by Edward Von Martens, it 

 appears that he regards Paludestrina and Hydrohia as synonyms 

 and = to Amnicola, Gould. In July of this year, I sent a paper 

 to the Royal Society of Tasmania, in which I reviewed the whole 

 synonoray of Hydrohiaj Amnicola, Lithoglyphus, Paludestrina, 

 Paludina, Paludinella, Littorina, and Bythinia, all of which 

 have at one time or another been regarded as names for the 

 same kinds of shells. After having sent away my paper I was 

 allowed to withdraw it, having found that P. Fischer had in the 

 Journal of Conchology for April, 1878, given a valuable note on 

 the same subject. I was thus enabled to incorporate his con- 

 clusions with ray own, he having the advantage of seeing types 

 of the genera he dealt with. His conclusions were nearly the 

 same as 1 had arrived at, except that I was not aware any more 

 than Von Martens, that Hartmann's Hydrohia entirely referred to 

 marine species. Now Martens, it appears, regards Hydrohia 

 corolla of Gould, as the type of Stimpson's Potamopyrgus, an 

 opinion which is hardly shared by P. Fischer, as far as I can 



