Periaulax
Periaulax is an extinct genus of gastropods in the family Trochidae. Species 
Species in the genus Periaulax include:
 Periaulax rimosus
 Periaulax tsheganica Amitrov, 2010 - It existed in what is now Kazakhstan during the Eocene period. It formerly contained the species Periaulax spiratus, which is currently recognized as Margarites spiratus. References

Trochidae
Prehistoric gastropod genera