P1000537

P1000537

Observation - P1000537 - UK and Ireland. Description: The crinkled growth lines at intervals on the outer whorl of this shell suggest that it may either have had to retreat for a time during growth, or it occasionally had some trouble obtaining enough calcium carbonate for shell growth.

The crinkled growth lines at intervals on the outer whorl of this shell suggest that it may either have had to retreat for a time during growth, or it occasionally had some trouble obtaining enough calcium carbonate for shell growth.