i think they are to big for snail eggs. they are maybe 1/8 in long. they're all along the under side of the rock, and go way up into a crack. the more i look at the rock the more i see of them. there's probably 50-60. i don't think it's sponge since there are many long spots. at first glance i thought it was an anemone i "lost" a long time ago, but it's to long and skinny. i don't have a better camera to get a better picture. i guess i'll just have to wait it out and watch to see what happens.