The yellow thing is the operculum, ie. door, all snails have them. The tentacles you are referring to must be its antennae.
Maybe email Ron Shimek and see what he says. He has a forum on RC as well.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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