Snail Eggs?

[rontam1979]

I found these this morning on the glass of the tank. They look like eggs but I wanted to confirm. They are about a centimeter in length and is like a small mound (couldn't get a good picture from the side). I have cerith snails, 1 fighting conch, scarlet hermits, 1 cleaner shrimp, two false perculas, and 1 scooter blenny. I thought they might be cerith snail eggs but the pictures I found on the web were usually zig-zaggy and stringy, not like a mound. Can any confirm what these things are? Thanks in advance.
Ron

 

[bang guy]

Doesn't look like Cerith to me. Possible some type of Whelk. Tough to tell. The Cyano to the right isn't a good thing though