I found a really nice site that gave some really good info on snails. http://www.marinelifephotography.com/ It is mostly photography in Hawaii but the families are the same so maybe you can find your snail here.

The second pic - if you are asking about the orange stuff - it's an encrusting sponge that may or may not stick around. Sponge generally dissipates as it's been exposed to the air but some of it has stayed around for 3 months now in my tank.

Yes the snail and the sponge will survive your cycling.

:-)