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Spherical without siphonal groove

Periwinkles

Picture informations: Periwinkles
Author(s)	Rainer Borcherding
Licence owner	Schutzstation Wattenmeer
Licence statement	Copyrighted Material; the copyright remains with the author (not this web publication)
Licence	cc-by-sa 3.0

Columella centally closed (without umbilicus)

Moon snails

Picture informations: Moon snails
Author(s)	Rainer Borcherding
Licence owner	Schutzstation Wattenmeer
Licence statement	Copyrighted Material; the copyright remains with the author (not this web publication)
Licence	cc-by-sa 3.0

Round hole (umbilicus) below, shell globular

Chink shells

Picture informations: Chink shells
Author(s)	Rainer Borcherding
Licence owner	Schutzstation Wattenmeer
Licence statement	Copyrighted Material; the copyright remains with the author (not this web publication)
Licence	cc-by-sa 3.0

Umbilicus slit-shaped, shell globular