62 On some New Marine Mollusca. 



extus plus minusve nehulosa et maculata. Long. 44, Lat. 

 47, Alt. 44. 



Shell broadly orbicular, hut slightly transverse, thick, 

 somewhat tumid, validly radiately ribbed ; rihs 25 to 35, 

 broad, flattened, becoming very close at the sides as the 

 shell grows; margins broadly toothed; cardinal teeth 16 

 to 20, white ; colour white stained, but intense fulvous brown 

 within, and more or less clouded and spotted with the same 

 colour on the outside. Victoria and Tasmania. Not com- 

 mon. Resembling P. radians, Lam., but differing in the 

 particulars italicised above. It seems also to be almost 

 without periostraca. Very near P. laticostatus, Lam., which 

 Prof. Tate informs me is found at Spencer's Gulf and N. Tas- 

 mania. It may turn out not to be specifically distinct from 

 that shell which is so abundant in our Miocene Tertiaries. 



Tkuncatella micka, n.s. T. t. minuta, alha, trans- 

 tucida, cylindracea; anf. 4 (decollatis) irregulariter costato- 

 striatis, inflato-convexis ; sutura impressa, apertura parva, 

 semilunari, labro reflexo. Long. 4 J, Lat. IJ. Brighton, 

 Victoria. 



Shell minute, white, translucent, cylindrical; whorls 4, 

 (decollate) irregularly costately striate, inflatedly convex ; 

 suture impressed, aperture small, semilunar, outer Up reflexed. 



There are so many TruncatellcE described, which run so 

 closely to each other, that I hesitate to add this species. It 

 seems, however, to differ widely enough from aU known to 

 me to warrant my giving it a name. It was found by Mr. 

 Kersha-w. 



The following freshwater sheUs were placed in my hands 

 for the most part by Mr. W. Kershaw, the intelligent taxi- 

 dermist and collector for the National Museum. It wiU be 

 seen that I describe as new species several ciliated Physo3, 

 which I regard as being very close to those already described 

 by me as from Tasmania. Freshwater shells, it must be 

 remembered, have always a very wide range, being carried 

 about by aquatic birds in their migrations. Thus I have 

 found many freshwater and fluviatile species common to 

 North-east Australia and New Caledonia. Yet strange to 

 say there is sometimes a great difference found in the species 

 inhabiting freshwater lakes or streams within a short 

 distance. The species common to Tasmania and Victoria 

 are pretty numerous, and more may yet be found. Bythinia 

 HuonensiSj nobis (which Professor Tate considers should be 



