>This shell looks like a Brotia or something similar, brackish water shells
>which are variously placed in Thiaridae, Pleuroceridae, Melanatriidae, etc.,
>depending upon which author you read.

The spire looks very like Acrilla but the aperture/columella are not
epitoniid. I agree, it's a freshwater or brackish cerithioid (many of
hese things can be found well above the brackish parts of rivers).
The operculum could well be epitoniid; it is more circular than those
of Melanopsis or Thiara.
--
Andrew Grebneff
165 Evans St, Dunedin 9001, New Zealand
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