Fun at the beach

When we were playing at the beach this holidays, we saw these strange sand shells.  The were kind of hard, but crumbled if we crushed them.  They were not slimy.  We were really not sure what they were.

But on the last day at the island, we found out what they were.  They are from eggs that hatch.  it is the padding to protect the eggs.  Two other kids tolds us.  But we are not sure what kind of creature uses these shells made of snot and sand.



Does anyone know?  Here are a few other pictures.  Love, Jenna