Bullidae
Bullidae is a family of sea snails, marine gastropod mollusks. These snails are commonly known as bubble snails or bubble shells due to the inflated, shell-like structure they possess. The shell, while often thin and brittle, is typically rounded and hollow, giving the appearance of a bubble. However, this structure is not a true shell in the same way as many other gastropods; it is an internal shell or a reduced external shell that has become internal.
The family Bullidae is characterized by its ovate or globular shell and a generally soft, fleshy body.