The operculum is round, light brown, horny, multispiral with a central nucleus.
12.
The oblong operculum is orbicular and multispiral.
13.
The operculum is small, roughly circular, dark brown, multispiral, and chitinous.
14.
The Trochidae differ from the Turbinidae in having a corneous, never calcareous, operculum, which is always multispiral.
15.
The genus " Mangelia " used to be defined by a multispiral protoconch, contrary to the genus " Mangeliella"
16.
(Original description by W . H . Dall ) The thin shell is brilliantly nacreous . it is inflated and has a depressed-conical shape with five operculum is corneous and multispiral.
17.
W . H . Dall recognized this species as " Tegula regina " because the operculum is horny and moderately multispiral, instead of possessing a heavy calcareous operculum as in true Uvalinas.
