Archachatina degneri (Bequaert & Clench, 1936) - The captive specimens of this snail have a light brown shell and sometimes a faded periostracum, especially near the apex. There may be faint yellow flames on the shell. The body is lighter than that of A. marginata, more grey, and feels softer and the V shape on the tail is less prominent. There is a stripe down the neck, as with nearly all achatinids. They reach only 10cm in shell length, when the snail is fully grown the lip of the shell becomes everted. The best way to tell it is degneri is the colour of the inside of the aperture, which is usually red or purple. Care is the same as margies. I only recently discovered one of my snails was a degneri, when it was sold to me as a margie
Raphael emailed back. He says the snail could either be degneri or buylaerti, and that you cannot accurately distinguish the species apart from their geographical range. degneri is from Ghana and buylaerti is from Togo and Benin. He says his buylaerti were shipped over from Africa.
but I think Gabriel is degneri because buylaerti are so much more uncommon