Try to bake a normal map out of the highpoly mesh/snail on the low(er)poly mesh/snail. There is a tutorial on cgcookie which explains this process. It basically tricks the lighting and tells your eye there is a curve, but there isn’t one or less than in the high poly version. But if you zoom in, the mesh reveals its true nature!
https://cgcookie.com/course/intro-to-normal-map-modeling-for-games
