Could very well be a whelk. Tough to know for certain what type, might try http://www.gastropods.com. Some are algae eaters, some eat detritus/decaying organic matter, some eat live critters...
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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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