mystery snail

Found this guy on my glass today and was wondering what it could be. I haven't added anything in probably 2-3 months, one which was a clump of Dragons' Breath/Chaeto macroalgae. Current list of snails is as follows: 5-7 Ceriths 1 Bumblebee 1 Magherita (maybe 2?) 2 Money Cowrie It looks almost...