Bivalve Sanibel Island, FL Dec. 16, 2009 These were some of the largest bivalve shells I found on the beach (other than the Pen shells).
Bivalve Sanibel Island, FL Dec. 16, 2009 These shells are very easy to identify due to their distinctive cross-hatched lines. The lines may help deter predatory snails that cut through the shells to eat the animal inside.
spp. / Gastropod Sanibel Island, FL Dec. 16, 2009 This is what made the strange convoluted marks in the sand! The little snail was crawling about hunting for tiny morsels to eat for breakfast!
