I agree with Tamar, most probably a whelk egg case! There is definitely algae growing /on/ it, though. It'll be difficult to get the right species from this, but maybe start with Busycon genus?
Hi Juan! This reminds me a lot of Whelk egg cases:
http://www.projectnoah.org/spottings/6189244
http://www.projectnoah.org/spottings/12757895
http://www.nccoastalreserve.net/images/gallery/photostore/6/knobbed%20whelk%20w.%20egg%20case.JPG
I just don't know what species. It is not the same as the ones referenced above but seems quite similar in structure to me.
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