EXAMPLES FROM THE WEB FOR UMBILICATED
In this case the shell is said to be umbilicated, and the opening referred to is the umbilicus.
Each of these lenses is umbilicated, or marked with a central depression.
A generic division of the species composing Ranella, characterized as having the shell not umbilicated.
The shell is described as heliciform, umbilicated, transparent, with the aperture transverse.
Shell flattened, umbilicated; foot anteriorly truncated with angles produced into lobes.