|interior of same specimen shown above|
This unusual shape of a fossil is an internal cast of C. princeps. Complete internal casts of shells like this are some of the most puzzling fossils for new collectors.
Grandecrepidula princeps, like other species in this family, commonly forms vertical stacks ("chains") of individuals. This is done for reproductive purposes.
The geologic range of C. princeps is early Miocene through middle Pleistocene.