All the shells in the first photo are dextral. The second photo has the aperture views of shells h, I, j, and l looking sinistral but not the dorsal views. Based on this, I would say the images for those 4 aperture views are reversed.
Happy New Year,
John
John and Cheryl Jacobs
President/Editor St. Petersburg Shell Club
COA 2024-2025 Oral/Silent Auction Chairs
Seffner, FL
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-----Original Message-----
From: Conchologists List <[log in to unmask]> On Behalf Of Erick Staal
Sent: Wednesday, December 27, 2023 10:44 AM
To: [log in to unmask]
Subject: Re: [CONCH-L] Columbella rustica in Mesolithic burial site
Hi John,
Thanks for your feedback. I tried to have a look at the shells at the top-right of the first photo, but these all seem right-handed to me.
Perhaps I'm looking at the wrong shell(s)?
By the way. The second photo definitely has mirror-images: please have a look at the Columbella specimens f, g, h, i and j. Assuming that these all depict the same shell once from the back and once from the front per shell, the shells on the back are depicted right-handed (I rotated the shells in my head. :-) ), but the photo's with the apertures towards the viewer are depicted left-handed. This cannot both be true (if e.g. the
shell(s) depicted under f represent the same shell).
As I dared to state before: I've seen many specimens of Columbella rustica and I wish there would have been a sinistral one in my sights, but alas.
Sincerely, Erick
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