umbilicated

Placed by De Blainville in that division of Ranella, which is characterized as being umbilicated.

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.

In this case the shell is said to be umbilicated, and the opening referred to is the umbilicus.