I'm sorry, but tweediei is a conspecific with tortuosa (Beck, 1837) as is published by van Benthem Jutting in 1960: Some notes on land- and freshwater Mollusca of Malaya.-Basteria 24: 10-20
tweediei is published in 1948 in the Proc. malac.Soc. London, 27: 225, pl. 11, fig. 6: type locality is Malaysia, Perlis, Kaki Buket
tortuosa is described by Chemnitz, 1795  (Syst. Conch, Cab. vol. 11: 158, pl. 195, fig. 1882 & 1883) as Turbo tortuosus without type locality. As the names of Chemnitz are become invalid, the name tortuosus became valid by a publication by Beck in 1837 (Index Molluscorum preasentis aevi musei principis Augustissimi Christiani Frederici. Sowerby (1864, Thesauris 3, pl. 264, fig 1) said tortuosus came from the Nicobar Islands. I saw large lots from Thailand and could collect in Perlis (Malaysia) a few specimens only.
In 2001 I published a "Preliminary checklist of the non-marine Molluscs of West Malaysia" , 155 pps. Copies are available from : Hemmen, Grillparzerstrasse 22, D65187 Wiesbaden, Germany

yours

Wim Maassen

> -----Oorspronkelijk bericht-----
> Van:  Kurt Auffenberg [SMTP:[log in to unmask]]
> Verzonden:    vrijdag 5 april 2002 16:44
> Aan:  [log in to unmask]
> Onderwerp:         Re: [CONCH-L] Mystery Terrestrials
>
> Perlisia tweediei (Tomlin,1948) is indeed the correct name for the Thai creature.  It is extremely abundant at many limestone areas in southern Thailand, living under leaf litter near the bases of cliffs.
>
> Tortulosa is not known to occur outside of India.  The genus is more diverse in Sri Lanka and southern India, I believe, but don't quote me on that.  It may, in fact, be endemic to that area of the world.  The main difference is in the aperture.  Tortulosa has a channel (most probably for respiration) in the apertural lip.  The aperture of Perlisia is more cyclophoroid (in the truest sense), i.e. not interrupted by a channel....
>
> The picture of the live specimen brought back some good memories......Kurt
>
> At 07:11 AM 4/4/02 -0500, you wrote:
> >>>>
>
>       Kurt, Geoff and other interested Conch-L terrestriophiles,
>
>       A picture of a live specimen of Andrew Sharpe's unidentified Thailand operculate
>       ( <http://www.manandmollusc.net/mystery_shell_andrew_terrestrial.html>http://www.manandmollusc.net/mystery_shell_andrew_terrestrial.<http://www.manandmollusc.net/mystery_shell_andrew_terrestrial.html>html ) appears on Sow-Yan Chan 's Molluscan Pictures Web site:  ( http://www.molluscan.com/shellimages/#P ).   The Molluscan Pictures Guestbook contains a note from Jaap Vermeulen and Wim Maassen commenting on this illustration (see below).  Like yourselves, both are knowledgeable non-marine researchers.
>