On 27-Dec-23 12:48 p.m., John Jacobs wrote: > 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. * it would be the kind of story archeologists love to tell to attribute the selection of sinistral shells to the dawn of malacological acuity among these Mesolithic folks. fred. ------------------------------------------------------- > -----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 > > 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. > -- ------------------------------------------------------------ Frederick W. Schueler & Aleta Karstad Fragile Inheritance Natural History - https://fragileinheritance.ca/ FI Newsletter - https://clt1233162.benchmarkurl.com/c/v?e=15E5037&c=12D10A&t=0&l=53EF5F06 Database fund-raiser - https://clt1233162.bmeurl.co/F0DE970?utm_source=BenchmarkEmail&utm_campaign=January_-_February_2023 2022 annual letter: https://clt1233162.bmeurl.co/EFE49F7 6 St-Lawrence Street Bishops Mills, RR#2 Oxford Station, Ontario K0G 1T0 on the Smiths Falls Limestone Plain 44.87156° N 75.70095° W (613)258-3107 <bckcdb at istar.ca> ------------------------------------------------------------ ---------------------------------------------------------------------- [log in to unmask] - a forum for informal discussions on molluscs To leave this list, click on the following web link: http://listserv.uga.edu/scripts/wa-UGA.exe?SUBED1=conch-l-L&A=1 Type your email address and name in the appropriate box and click leave the list. ----------------------------------------------------------------------