• Common egg cowrie / egg cowrie / eggshell cowrie

Scientific classification:
Kingdom:Animalia
Phylum:Mollusca
Class:Gastropoda
(unranked):clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily:Cypraeoidea
Family:Ovulidae
Subfamily:Ovulinae
Genus:Ovula
Species:O. ovum

101mm

Nocnocan Island, Bohol, Philippines

From my collection

via Flickr https://flic.kr/p/2iwVKPD