Coelodiscus

Coelodiscus Temporal range: L-M Jurassic
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Superfamily:	Euomphaloidea
Family:	Euomphalidae
Genus:	Coelodiscus Broesamlen, 1909

Ceolodiscus is a genus in the gastropod family Euomphalidae from the Lower and Middle Jurassic of Europe. The shell is small but stocky; involute or with a slightly protruding spire. Whorls are generally smooth, evenly rounded and slightly overlapping; umbilicus deep, aperture ovate.

...
Wikipedia