oops - a little quick on the trigger there, sorry!
Here's the description of L. sertata:
Shell biconical, solid, strongly angled, sculptured with numerous
linear-spaced cords, that bear closely packed imbricated scales.  The cords
override axial folds that are strongest at the peripheral angle.  Color
pinkish-white; rose-pink within the aperture.  Length: 18-22 mm; width
10-12.5 mm.
Your shell apparently isn't this.  Don't know what it might be.
Regards,
Paul