You are admiring an incredibly interesting specimen, a Bulla ampulla (Linne, 1758) measuring 30.8mm & graded F+++...very unique, rather globose form with a gorgeous color pattern & markings displayed.  This beauty was collected by fishermen off Calitoban Island, Philippines.  A member of the very small/obscure Bullidae family & an excellent addition for your collection.  Thank you for visiting our store this afternoon...great to see you again.