my MS is open access titled "First Record Armina neapolitana (Delle chiaje,1824) (Gastropoda :Heterobranchia ) in the Sea of Marmara (Turkey).You can find in my Research Gare page..if you need more collaboration please well come..Your sample seem to be Armina..?
the measurements are Length = 70.02 mm, Width = 25.06. The specimen was in a retracted state when collected. Probably it was out of water for almost 10-12 hrs.
Dear Dr Tucner,
thank you for sharing the information. I have not confirmed it still and it is open for identity discussion.