White & Brown Ram Horn Snail Shells, some are all white, others have brown stripe. Sizes range but are approx 1.25-1.5". These are perfect add to shadowbox curiosities or to use in unique jewelry designs.
These are known as Marisa Cornuarietis- which are freshwater gastropods. 

Most shells average between 1.25-1.5" but some may be slightly smaller or larger.